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A model study is conducted to examine the role of Pacific water in the dramatic retreat of arctic sea ice during summer 2007. The model generally agrees with the observations in showing considerable seasonal and interannual variability of the Pacific water inflow at Bering Strait in response to changes in atmospheric circulation. During summer 2007 anomalously strong southerly winds over the PaCific sector of the Arctic Ocean strengthen the ocean circulation and bring more Pacific water into the Arctic than the recent （2000-2006） average. The simulated summer （3 months ） 2007 mean Pacific water inflow at Bering Strait is 1.2 Sv, which is the highest in the past three decades of the simulation and is 20% higher than the recent average. Particularly, the Pacific water inflow in September 2007 is about 0.5 Sv or 50% above the 2000-2006 average. The strengthened warm Pacific water inflow carries an additional 1.0 x 1020 Joules of heat into the Arctic, enough to melt an additional 0.5 m of ice over the whole Chukchi Sea. In the model the extra summer oceanic heat brought in by the Pacific water mainly stays in the Chukchi and Beaufort region, contributing to the warming of surface waters in that region. The heat is in constant contact with the ice cover in the region in July through September. Thus the Pacific water plays a role in ice melting in the Chukchi and Beaufort region all summer long in 2007, likely contributing to up to O. 5 m per month additional ice melting in some area of that region. 相似文献
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全球气候变暖目前已经成为人类越来越关注的社会问题。气象观测结果表明，2007年2月，中亚和东亚、欧洲大部、白令海峡及其附近地区、阿尔及利亚和澳大利亚大部气温明显偏高2℃以上，其中东亚部分地区和白令海峡附近地区显著偏高4℃～9℃。2006年冬季，我国大部地区气温较常年同期（-4．3℃）偏高1．9℃，为历史同期第二高值，其中黑龙江、吉林的部分地区偏高达4℃～6℃， 相似文献
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LIN Rongcheng HUANG Dingyong GUO Yuqing CHANG Yu CAO Yinkun WANG Jianjia 《海洋学报(英文版)》2014,33(6):90-94
The metazoan meiofauna in the Chukchi Sea were collected from seven shallow water stations(depths ranging 46 to 52 m) and five deep sea stations(depths ranging between 393 and 2 300 m) during the 4th Chinese National Arctic Research Expedition in 2010. The results showed that abundance of meiofauna was higher in shallow water sediments(average of 2 445 ind./(10 cm2)) than in deep sea sediments(407.06 ind./(10 cm2)). A UNIANOVA test for difference between the two different regions was highly significant(F=101.15, p0.01). Nematodes were numerically dominant, representing(96.6±4.6)% of the total meiofaunal abundance at the shallow water stations and(98.90±1.42)% at deep sea stations. The number of higher taxonomic groups and abundance of meiofauna were higher at Stas CC1, CC4, and R06 near the Bering Strait and the continent, than at the rest of the shallow water and deep sea stations. The primary factors causing the differences were concentrations of nutrients P and Si of bottom seawater(R=0.831, p0.003), followed by depth(R=-0.655, p0.05) and sand fractions of sediments(R=0.632, p 0.05). The numbers of meiofauna on the 65 μm and 32 μm sieves were significantly higher than those on the rest of the screens. Differences in numbers of meiofauna retained on screens with different mesh openings were highly significant among all sampling stations(F=31.60, p0.01). The highest numbers of individuals on screens with 32 μm mesh openings were found at deep sea stations. The number of meiofauna in the top 0–1, 1–2, and 2–4 cm segments constituted 84.4% of the total and was significantly higher than those in the bottom 4–6 and 6–10 cm segments(F=15, p0.01). 相似文献
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部落里最优秀的猎手,甚至仅凭着一杆鱼叉,或是一根梭镖,顶着冻原上凛冽的北风和北冰洋冰冷的海水,去和世界上最庞大的动物——鲸搏斗.对于从未见识过海洋威力的他们,究竟需要何等的勇气与信念.不知何时起,穿越小说蝗虫般地席卷了各大网站的读书频道,穿越剧也霸占了电视台的黄金档,颇有些“忽如一夜春风来”的味道.细想起来,每每在回溯... 相似文献
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2003-2012年间白令海峡断面淡水构成的时空变化 总被引：3，自引：1，他引：2
通过对2003-2012年间白令海峡64.3°N断面海水氧同位素组成的分析,应用海水δ18 O值和盐度的质量平衡关系区分出淡水中河水和海冰融化水组分的贡献,探讨白令海峡淡水组成的分布特征及其年际变化。研究表明,断面东侧阿拉斯加沿岸水影响区呈现低δ18 O值、低盐、高温、高河水组分的特征,西侧阿拉德尔水具有高δ18 O值、高盐、低海冰融化水的特征,中部白令陆架水的δ18 O值、盐度和淡水组成则居于上述二者之间。阿拉斯加沿岸水影响区河水组分的份额约为阿拉德尔水和白令陆架水的2倍,并呈现出2010年2012年2003年2008年的时间变化规律,受控于育空河入海径流量的时间变化。白令陆架水和阿拉斯加沿岸水影响区的海冰融化水份额较为接近,均比阿拉德尔水影响区的海冰融化水份额高约45%。海冰融化水的年际变化表现出2003年2008年≈2012年2010年的规律,受控于白令海海冰的年际变动。从断面淡水构成看,通过白令海峡的淡水平均由46%的河水和54%的海冰融化水构成,且阿拉德尔水、白令陆架水和阿拉斯加沿岸水影响区河水组分与海冰融化水组分的比值自2003年至2012年间呈增加趋势,证明太平洋入流中淡水构成的变化对北冰洋海冰的融化也起着一定的作用。 相似文献
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根据 2 0 0 3年中国第二次北极科学考察资料 ,并结合历史现场调查资料和同期的海冰分布 ,分析了白令海峡及其周围海域的水体结构及变化情况 ,得到如下结论 :( 1 ) 2 0 0 3年夏季白令海峡区域层结构季节内变化显著 ,东西部呈两层结构 ,而中部上下水体均匀一致 ,( 2 )白令海峡邻近海域温盐结构是东部高温低盐 ,西部低温高盐 ,西部存在明显上升流特征 ;( 3)白令海峡的水交换以北太平洋水通过白令海峡进入北冰洋为主 ,而温度、盐度的分布也与北向的输运是匹配的。 相似文献
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NCAR科学家Aixue Hu的研究表明,10万年前冰河时代白令海海面上升可能曾经致使当时的气候型发生变化。由于海平面的升降导致白令海峡开合,太平洋与大西洋之间的洋流受到影响,从而改变太平洋与大西洋之间的热量输送和大西洋的盐度,所以北美与格陵兰部分地区夏季温度出现冷暖振荡,致使冰原进退,并影响全球的海平面高度。该研究成果发表在2010年1月的Nature Geoscience杂志上。 相似文献
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太平洋南北两端的四个边缘海,都是以欧洲几个探险家的姓氏命名的,它们是白令海、罗斯海、阿蒙森海和别林斯高晋海.这几个人以白令最为著名,这几个海也以白令海最为人们所熟知.
白令(Bering Vitus,1681-1741年)原为丹麦航海家,1703年他22岁时,开始在俄国海军中服役.1724年,俄皇彼得大帝命他率领一支探险队,考察亚洲与北美洲是否在陆上相连.这是他领导的第一次堪察加探险.此次探险活动前后持续6年之久.他先于1725年从圣彼得堡出发,横穿西伯利亚,然后渡过鄂霍次克海到堪察加半岛,再横穿半岛抵达东海岸,但未继续前进,即行折回.真正的远航开始于1728年. 相似文献
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