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From Wikipedia, the free encyclopedia
Broken pieces of sea ice with a snow cover.
Sea ice arises as
freezes. Because
is less dense than water, it floats on the ocean's surface (as does
ice, which has an even lower density). Sea ice covers about 7% of the Earth’s surface and about 12% of the world’s oceans. In the North, it is found in the , in areas just below it and in other cold oceans, in the , it occurs in various areas around
(the continent). Much of the world's sea ice is enclosed within the
in the Earth's : the
ice pack of the
and the Antarctic ice pack of the .
undergo a significant yearly cycling in surface extent (see ), a natural process upon which depends the , including the . Due to the action of winds, currents and temperature fluctuations, sea ice is very dynamic, leading to a wide variety of ice types and features. Sea ice may be contrasted with , which are chunks of
into the ocean. Depending on location, sea ice expanses may also incorporate .
Hypothetical sea ice dynamics scenario showing some of the most common sea ice features.
Sea ice does not simply grow and melt. During its lifespan, it is very dynamic. Due to the combined action of winds, currents and air temperature fluctuations, sea ice expanses typically undergo a significant amount of deformation. Sea ice is classified according to whether or not it is able to drift, and according to its age.
Sea ice can be classified according to whether or not it is attached (or frozen) to the shoreline (or between
or to grounded ). If attached, it is called landfast ice, or more often,
(from fastened). Alternatively, and unlike ,
occurs further offshore in very wide areas, and encompasses ice that is free to move with currents and winds. The physical boundary between fast ice and drift ice is the fast ice boundary. The drift ice zone may be further divided into a shear zone, a marginal ice zone and a central pack. Drift ice consists of floes, individual pieces of sea ice 20 metres (66 ft) or more across. There are names for various floe sizes: small – 20 metres (66 ft) to 100 metres (330 ft); medium – 100 metres (330 ft) to 500 metres (1,600 ft); big – 500 metres (1,600 ft) to 2,000 metres (6,600 ft); vast – 2 kilometres (1.2 mi) to 10 kilometres (6.2 mi); and giant – more than 10 kilometres (6.2 mi). The term pack ice is used either as a synonym to drift ice, or to designate drift ice zone in which the floes are densely packed. The overall sea ice cover is termed the ice canopy from the perspective of submarine navigation.
Another classification used by scientists to describe sea ice is based on age, that is, on its development stages. These stages are: new ice, nilas, young ice, first-year and old.
New ice is a general term used for recently frozen sea water that does not yet make up solid ice. It may consist of
(plates or spicules of ice suspended in water),
(water saturated snow), or shuga (spongy white ice lumps a few centimeters across). Other terms, such as
and , are used for ice crystal accumulations under the action of wind and waves.
Nilas designates a sea ice crust up to 10 centimetres (3.9 in) in thickness. It bends without breaking around waves and swells. Nilas can be further subdivided into dark nilas – up to 5 centimetres (2.0 in) in thickness and very dark, and light nilas – over 5 centimetres (2.0 in) in thickness and lighter in color.
Young ice is a transition stage between nilas and first-year ice, and ranges in thickness from 10 centimetres (3.9 in) to 30 centimetres (12 in), Young ice can be further subdivided into grey ice – 10 centimetres (3.9 in) to 15 centimetres (5.9 in) in thickness, and grey-white ice – 15 centimetres (5.9 in) to 30 centimetres (12 in) in thickness. Young ice is not as flexible as nilas, but tends to break under wave action. In a compression regime, it will either raft (at the grey ice stage) or ridge (at the grey-white ice stage).
Distinction between 1st year sea ice (FY), 2nd year (SY), multiyear (MY) and old ice.
First-year sea ice is ice that is thicker than young ice but has no more than one year growth. In other words, it is ice that grows in the fall and winter (after it has gone through the new ice — nilas — young ice stages and grows further) but does not survive the spring and summer months (it melts away). The thickness of this ice typically ranges from 0.3 metres (0.98 ft) to 2 metres (6.6 ft). First-year ice may be further divided into thin (30 centimetres (0.98 ft) to 70 centimetres (2.3 ft)), medium (70 centimetres (2.3 ft) to 120 centimetres (3.9 ft)) and thick (&120 centimetres (3.9 ft)).
Old sea ice is sea ice that has survived at least one melting season (i.e. one summer). For this reason, this ice is generally thicker than first-year sea ice. Old ice is commonly divided into two types: second-year ice, which has survived one melting season, and multiyear ice, which has survived more than one. (In some sources, old ice is more than 2-years old.) Multi-year ice is much more common in the Arctic than it is in the Antarctic. The reason for this is that sea ice in the south drifts into warmer waters where it melts. In the Arctic, much of the sea ice is land-locked.
is relatively stable (because it is attached to the shoreline or the seabed),
undergoes relatively complex deformation processes that ultimately give rise to sea ice’s typically wide variety of landscapes. Wind is thought to be the main driving force along with ocean currents. The
and sea ice surface tilt have also been invoked. These driving forces induce a state of stress within the drift ice zone. An
converging toward another and pushing against it will generate a state of compression at the boundary between both. The ice cover may also undergo a state of tension, resulting in divergence and fissure opening. If two floes drift sideways past each other while remaining in contact, this will create a state of .
Sea ice deformation results from the interaction between ice floes, as they are driven against each other. The end result may be of three types of features: 1) , when one piece i 2) , a line of broken ice forced downward (to make up the keel) and upward (to make the sail); and 3) , an hillock of broken ice that forms an uneven surface. A shear ridge is a pressure ridge that formed under shear – it tends to be more linear than a ridge induced only by compression. A new ridge is a recent feature — it is sharp-crested, with its side sloping at an angle exceeding 40 degrees. In contrast, a weathered ridge is one with a rounded crest and with sides sloping at less than 40 degrees.
are yet another type of pile-up but these are grounded and are therefore relatively stationary. They result from the interaction between
and the drifting pack ice.
Level ice is sea ice that has not been affected by deformation, and is therefore relatively flat.
are areas of open water that occur within sea ice expanses even though air temperatures are below freezing, and provide a direct interaction between the ocean and the atmosphere, which is important for the wildlife. Leads are narrow and linear – they vary in width from meter to km scale. During the winter, the water in leads quickly freezes up. They are also used for navigation purposes – even when refrozen, the ice in leads is thinner, allowing icebreakers access to an easier sail path, and submarines to surface more easily. Polynyas are more uniform in size than leads and are also larger – two types are recognized: 1) Sensible-heat polynyas, caused by the upwelling of warmer water and 2) Latent-heat polynyas, resulting from persistent winds from the coastline.
Aerial view showing an expanse of drift ice offshore Labrador (Eastern Canada) displaying floes of various sizes loosely packed, with open water in several networks of . (Scale not available.)
Aerial view showing an expanse of drift ice in southeastern Greenland, comprising loosely packed floes of various sizes, with a
developing in the centre.(Scale not available.)
Aerial view showing an expanse of drift ice consisting mostly of water. (Scale not available.)
Close-up view inside a drift ice zone: several small rounded floes are separated from each other by slush or grease ice. (Bird at lower right for scale.)
Example of hummocky ice: an accumulation of ice blocks, here about 20 to 30 cm in thickness (with a thin snow cover).
Field example of a pressure ridge. Only the sail (the part of the ridge above the ice surface) is shown in this photograph – the keel is more difficult to document.
Aerial view of the Chukchi Sea between Chukotka and Alaska, displaying a pattern of . Much of the open water inside those leads is already covered by new ice (indicated by a slightly lighter blue color)(scale not available).
Main article:
Satellite image of sea ice forming near
in the Bering Sea.
Only the top layer of water needs to cool to the freezing point. Convection of the surface layer involves the top 100 – 150 m, down to the
of increased density.
In calm water, the first sea ice to form on the surface is a skim of separate crystals which initially are in the form of tiny discs, floating flat on the surface and of diameter less than 0.3 centimetres (0.12 in). Each disc has its c-axis vertical and grows outwards laterally. At a certain point such a disc shape becomes unstable, and the growing isolated crystals take on a hexagonal, stellar form, with long fragile arms stretching out over the surface. These crystals also have their c-axis vertical. The dendritic arms are very fragile, and soon break off, leaving a mixture of discs and arm fragments. With any kind of turbulence in the water, these fragments break up further into random-shaped small crystals which form a suspension of increasing density in the surface water, an ice type called . In quiet conditions the frazil crystals soon freeze together to form a continuous thi in its early stages, when it is still transparent — that is the ice called nilas. Once nilas has formed, a quite different growth process occurs, in which water freezes on to the bottom of the existing ice sheet, a process called congelation growth. This growth process yields first-year ice.
In rough water, fresh sea ice is formed by the cooling of the ocean as heat is lost into the atmosphere. The uppermost layer of the ocean is
to slightly below the freezing point, at which time tiny ice platelets (frazil ice) form. With time, this process leads to a mushy surface layer, known as . Frazil ice formation may also be started by , rather than supercooling. Waves and wind then act to compress these ice particles into larger plates, of several meters in diameter, called . These float on the ocean surface, and collide with one another, forming upturned edges. In time, the pancake ice plates may themselves be rafted over one another or frozen together into a more solid ice cover, known as consolidated ice pancake ice. Such ice has a very rough appearance on top and bottom.
If sufficient snow falls on sea ice to depress the freeboard below sea level, sea water will flow in and a layer of ice will form of mixed snow/sea water. This is particularly common around .
() devoted his life to study the Arctic ice pack and developed the Scientific Prediction of Ice Conditions Theory, for which he was widely acclaimed in academic circles. He applied this theory in the field in the , which led to the discovery of .
Seasonal variation and annual decrease of Arctic sea ice volume as estimated by measurement backed numerical modelling.
Volume of arctic sea ice over time using a polar coordinate system draw method (time go one cycle per year)
Sea ice freezes and melts due to a combination of factors, including the age of the ice, air temperatures, and solar insolation. During the winter the area of the Arctic Ocean covered by sea ice increases, usually reaching a maximum extent during the month of March. The area covered in sea ice then decreases, reaching its minimum extent in September most years. First-year ice melts more easily than older ice for two reasons: 1) First-year ice is thinner than older ice, since the process of congelation growth has had
and 2) first-year ice is less permeable than older ice, so summer meltwater tends to form deeper ponds on the first-year ice surface than on older ice, and deeper ponds mean lower
and thus greater solar energy capture.
Main article:
Changes in sea ice conditions are best demonstrated by the rate of melting over time. A composite record of Arctic ice demonstrates that the floes’ retreat began around 1900, experiencing more rapid melting beginning within the past 50 years. Satellite study of sea ice began in 1979, and became a much more reliable measure of ice melt and polar climate change. In comparison to the extended record, the sea-ice extent in the polar region by September 2007 was only half the recorded mass that had been estimated to exist within the
The volume of ice hit an all-time low in September 2012, when the ice was determined to cover only 24% of the Arctic Ocean, offsetting the previous low of 29% in 2007. Future predictions cast that summer sea ice might disappear altogether as soon as 2020. During the warmest years, like the winter of , sea ice is observed to reach a winter maximum extent that is smaller than in the years before or after. The summer minimum Arctic ice extent for 2010 was the third lowest over the period of satellite observations of the polar ice.
In order to gain a better understanding about the variability, numerical sea ice models are used to perform . The two main ingredients are the
and the thermodynamical properties (see ,
(GCMs) have sea ice implemented in their numerical simulation scheme in order to capture the
correctly. Examples are:
developed at
(MIT) includes a package for sea-ice (). The code is freely available there.
(UCAR) develops the Community Sea Ice Model ().
has a project called Los Alamos Sea Ice Model (). CICE is
and designed as s component of GCM, although it provides a standalone mode.
The Finite-Element Sea-Ice Ocean Model () developed at
() offers a standard protocol for studying the output of coupled atmosphere-ocean general circulation models. The coupling takes place at the atmosphere-ocean interface where the sea ice may occur.
In addition to global modeling, various regional models deal with sea ice. Regional models are employed for seasonal forecasting experiments and for .
Main article:
Sea ice is part of the Earth's . When sea water freezes, the ice is riddled with brine-filled channels which sustain
such as bacteria, algae, copepods and annelids, which in turn provide food for animals such as krill and specialised fish like the , fed upon in turn by larger animals such as
A decline of seasonal sea ice puts the survival of Arctic species such as
As ice melts, the liquid water collects in depressions on the surface and deepens them, forming these melt ponds in the . These fresh water ponds are separated from the salty sea below and around it, until breaks in the ice merge the two.
Sea ice provides an ecosystem for various polar species, particularly the , whose environment is being threatened as global warming causes the ice to melt a bit more as the Earth’s temperature gets warmer. Furthermore, the sea ice itself functions to help keep polar climates cool, since the ice exists in expansive enough amounts to maintain a cold environment. At this, sea ice’s relationship with global the ice helps to maintain cool climates, but as the global temperature increases, the ice melts, and is less effective in keeping those climates cold. The bright, shiny surface of the ice also serves a role in maintaining cooler polar temperatures by reflecting much of the sunlight that hits it back into space. As the sea ice melts, its surface area shrinks, diminishing the size of the reflective surface and therefore causing the earth to absorb more of the sun’s heat. Though the size of the
is affected by the seasons, even a small change in global temperature can greatly affect the amount of sea ice, and due to the shrinking reflective surface that keeps the ocean cool, this sparks a cycle of ice shrinking and temperatures warming. As a result, the polar regions are the most susceptible places to climate change on the planet.
Furthermore, sea ice affects the movement of ocean waters. In the
process, much of the salt in ocean water is squeezed out of the frozen crystal formations, though some remains frozen in the ice. This salt becomes trapped beneath the sea ice, creating a higher concentration of salt in the water beneath ice floes. This concentration of salt contributes to the salinated water’s , and this cold, denser water sinks to the bottom of the ocean. This cold water moves along the ocean floor towards the equator, while warmer water on the ocean surface moves in the direction of the poles. This is referred to as “ motion”, and is a regularly occurring process.
Change in extent of the
ice between April and August, in 2013.
Sea ice off .
Sea ice imitates the shoreline along the .
Clear view of the , the , and the sea ice covered waters around the region.
The Earth showing the annual minimum sea ice with a graph overlay showing the annual minimum sea ice area in millions of square kilometers.
Weeks, Willy F. (2010). . University of Alaska Press. p. 2.  .
Shokr, M Sinha, Nirmal (2015). Sea Ice - Physics and Remote Sensing. John Wiley & Sons, Inc.  .
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(PDF). Quaternary Science Reviews: 2–17. :.
Gillis, Justin (19 Sep 2012). . The New York Times 2012.
Scott, Michon. . NASA Earth Observatory 2010.
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Barber, D.G.; Iacozza, J. (March 2004). . Arctic 57 (1): 1–14. :.  .
Stirling, I.; Lunn, N.J.; Iacozza, J.; Elliott, C.; Obbard, M. (March 2004). "Polar bear distribution and abundance on the southwestern Hudson Bay coast during open water season, in relation to population trends and annual ice patterns". Arctic 57 (1): 15–26. :.  .
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110 (C1): C01002. :. :.
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Wikimedia Commons has media related to .
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: Hidden categories:求初一英语试卷
求初一英语试卷
1.关于训练正在进行时的试卷2.关于训练一般过去时的试卷感激不尽
找出划线部分读音与其它三个不同的选项:(每题1分,共5分)()1.A.wh_o_B.hell_o_C.zer_o_D._o_ver()2.A.b_oo_kB.g_oo_dC.f_oo_tD.r_oo_m()3.A.ye_s_B.no_s_eC._s_itD.bu_s_()4.A.wh_ere_B.th_ere_C.h_ere_()5.A.J_a_paneseB.p_a_rrotC.wom_a_nD.m_a_nII.找出不属于同一范畴的选项:(每题1分,共5分)()1.A.EnglishB.ChinaC.JapaneseD.American()2.A.bikeB.carC.busD.cow()3.A.yoursB.mineC.ourD.theirs()4.A.pictureB.salesgirlC.friendD.student()5.A.coatB.penC.capD.skirtIII.英汉互译:(每题1分,共10分)1.onthefloor______2.lookafter______3.inblack____________4.overthere_______5.bytheway_______6.看上去像__________7.没有,用完_______8.去购物_______9.追求,追逐____________10.在树下_____________IV.根据要求写单词:(每题1分,共10分)1.same(反义词)__________2.right(反义词)__________3.long(反义词)____________4.new(反义词)__________5.bus(复数)___________6.pencil–box(复数)________7.toy(复数)___________8.foot(复数)___________9.Jim(所有格)___________10.Iam(缩略词)________________V.选择填空:(每题1分,共20分)1.Thanks______thephoto______yourfamily.A.forB.ofC.ofD.for2.—Arethoseyourcolorpencils?—Yes,____________.A.thoseareB.theyareC.itisD.thereare3.Ihave_______orange._______orangeison______desk.A.a;A;aB.an;An;theC.an;The;theD.An;a4.Thisisnot______coat.______isred.A.Kate’s;HersB.Kate’s;hersC.Kate;HersD.Kate’s;her5.—Canyouseethepicture?—Sorry,______________.A.Idon’tB.IamnotC.I’mnotD.Ican’t6.He’stall_______athinface.A.hasB.haveC.inD.with7.Pleasewritedownthenumber365inEnglish.A.Threehundredsandsixty-fiveB.Threehundredandsixty-fiveC.Threehundredsixty-fiveD.Threehundredandsixtyfive8.—____________________—I’meleven.A.Howdoyoudo?B.Howareyou?C.Howoldareyou?D.What’syourname?9.Todaywehavetwonewstudents.Please___________________.A.lookafterthemB.lookthemafterC.lookafterherD.lookafterhim10.—Issheatworkorathome?—_____________________.A.Yes,sheisB.No,sheisn’tC.She’soverthereD.She’sathome11.Colorthedesk_______,please.A.aredB.redC.redoneD.redcolor12.—What’syour________?—It’s.A.nameB.ateC.phoneD.family13.TheseareMary’sshoes.Givethemto_______.A.sheB.herC.hersD.it14.Theboy_______theyellowsweaterismybrother.A.inB.ofC.onD.to15.Thecapsonsale_______orange.A.isB.isanC.areD.arean16.—___________________doyouhave?—Twenty.A.HowmuchpensB.HowmanypensC.WhatcolorD.Whataboutpens17.________!Therearesomenice__________thetree.A.LinB.LinC.LonD.Son18.It’slate.Imust_____________now.A.gohomeB.gotohomeC.goschoolD.gotothere19.—Thankyouverymuch.—__________________.A.ThatisrightB.Yes,allrightC.That’sallrightD.Don’tthankme20.—Howmany___________doyouwant?—Twocups,please.A.cupsteaB.cupofteaC.cupsofteasD.cupsoftea26.___acatand___name'sMimi.()A.Iit'sB.It's;it'sC.IitsD.It's;its27.Thereare___books.___areoverthere.()A.WeB.MineC.HisD.YourVI.根据要求完成句子:(每空1分,共10分)1.Doyouhaveabigmouth?(变否定回答)No,I________.2.MayIhaveyourname?(改为同义句)________________name?3.Sheismyfriend.(对划线部分提问)________friendis________?4.Theblackbikeishis.(改为复数)Theblack_____________________.5.Openthedoor,please.(改为否定句)_________________thedoor,please.VII.补全对话,每空只能填写一个词:(每空1分,共10分)(J—JH—HamMG—MissGao)H:Hello,Jim.1areyou?J:Hi,Meimei.I’mfine.2.H:What3thetime?J:Let4see.It’sfiveo’clock.Whereis5watch?H:I6findit.Canyouseeit?J:Sorry,Ican’t.G:Whoseisthis7?J:MissGao,Ithink8HanMeimei’s.G:Meimei,isit9?H:Oh,yes,it’smine.G:Youmust10afteryourwatch.H:Thankyou,MissGao.VIII.完型填空:(每题1分,共10分)_____1_____fiveo’clockintheafternoon.Schoolisover.___2___theschoolgate.LiPing___3___ZhangHong.Theyarenotinthesameclass.LiPing:4,ZhangHong.I’mgoinghome.Areyou5,too?ZhangHong:No,I’mnotgoinghome.I’mgoingtoWeiFang’shome.LiPing:What’swrong6her?ZhangHong:Sheisill.Shedoesn’tcometoschooltoday.Imustgo_____7____helpher___8____her___9___.LiPing:Oh,Isee.Good-bye.ZhangHong:10.Notes:ill生病的see明白1.A.itB.TheyC.ItD.It’s2.A.AtB.InC.OnD.Out3.A.welcomesB.meetsC.watchesD.looks4.A.GoodmorningB.GoodeveningC.GoodafternoonD.Good-bye5.A.goinghomeB.gohomeC.gettinghomeD.gethome6.A.forB.toC.inD.with7.A.toB.forC.inD.with8.A.forB.toC.inD.with9.A.mealB.drinkC.lessonsD.games10.A.I’mgladtoseeyouB.NicetomeetyouC.GoodbyeD.I’mathomeIX.阅读理解:(每题2分,共20分)(A)根据短文内容,判断正(A)误(B):MynameisJane.I’mfrom(来自于)theUSA.I’mthirteen.I’minNo.2MiddleSchool.Myfatherisaworker(工人)andmymotherisaworker,too.Theyareinthesamefactory(工厂).Mybrother’snameisJack.Heisfifteen.HeisinNo.2MiddleSchool,too.Butwearenotinthesamegrade.HeisinGradeThreeandI’minGradeTwo.()1.JaneisanEnglishgirl.()2.Herfatherisadoctorandhermotherisaworker.()3.Herbrotherisfifteen.()4.JackisinNo.1MiddleSchool.()5.JackisinGradeTwo.(B)根据短文内容选择正确答案:MynameisLinda.I’minClass4,Grade2.I’minRow3.Kateismyfriend.Sheisinmyclass,too.SheisinRow1.Myfatherhasabeautifulcar.Thenumberis0479685.Andherfatherhasabeautifulcar,too.Thenumberis0—double4—7--double9—5.Sheoftendrivesthecartomyhome.Wearegoodfriends.Wearebothfifteen.1.WhatisLinda?A.SheisKate’sgoodfriend.B.Shehasabeautifulcar.C.Sheisagirl.D.SheisanEnglishgirl.2.WhatrowisLindain?A.SheisinRow4.B.SheisinRow2.C.SheisinRow1.D.SheisinRow3.3.WhatisthenumberofKate’sfather’scar?A.It’s0478685.B.It’s.C.It’s.D.It’s0447995.4.HowoldisLinda?A.Sheisfifteen.B.Sorry,Idon’tknowC.Sheisfive.D.Sheistwelve.5.What’snumberofLinda’sfather’scar?A.It’szero,three,two,one,four,three,one,two.B.It’szero,six,four,two,eight,six,two,four.C.It’szero,four,seven,nine,six,eight,five.D.It’szero,two,three,four,one,three,one,two.根据提示完成句子76.MikeandPeterareclosefriends.Theyusuallytaiktoeachother_________(接电话)83.—Hi,Tom.Whataniceday!Howaboutgoinghikingtogether?—That'sagoodidea.Let'saskJohntogotogether.He___(like)___(spend)thehoildayoutsideverymuch.—I'mafraidhecan't.He___(prepare)forthecomingEnglishtestathomenow.—___,he___(haveto)___(do)sonow?—Yes,you'reright.(84-88题要求写出同意句)84.Canyoulendmeyourdictionary?Canyou_______________?85.It'scoldtoday.Whydon'tyouclosethewindows?It'scoldtoday._________thewindows?86.Wouldyouliketogotothecinemawithus?___you______gotothecinemawithus?87.TheBrownfamilyaregoodatbiology.______aregoodatbiology.88.Lookatthegirlinred.Sheisoneofmyfriends.Lookatthegirlinred.Sheis____________.(94-95题要求连词成句)94.weight-training,doing,football,exercise,at,centre,the,are,some,pleyers,the_________________________________________________________________95.see,lab,interesting,on,they,the,specimens,second,can,many,in,the,floor_________________________________________________________________
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