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DOI | 10.1007/s00382-018-4444-4 |
Atlantic salinity budget in response to Northern and Southern Hemisphere ice sheet discharge | |
van den Berk, J.1; Drijfhout, S. S.1,2; Hazeleger, W.3,4 | |
2019-05-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:5249-5267 |
文章类型 | Article |
语种 | 英语 |
国家 | Netherlands; England |
英文摘要 | The impact of an idealised scenario of future mass release of major ice sheets on the Atlantic ocean is studied. A freshwater forcing is applied to the ocean surface in a coupled climate model forced in accordance with a high-end future climate projection for mass loss from the Greenland and Antarctic ice-sheet, together with the RCP8.5 emission scenario. The added freshwater dilutes the entire ocean by increasing total volume, but changes in freshwater budget are non-linear in time, especially in the Atlantic Ocean. In the Atlantic the initial dilution mainly comes from Greenland freshwater, but the increase in mass is counteracted by the mass flux across the boundaries of the Atlantic, with the outflow into the Southern Ocean becoming larger than the inflow through Bering Strait. Associated with this mass divergence, salt is exported to the Southern Ocean by the barotropic flow. Further freshening is associated with more freshwater import by the Atlantic Meridional Overturning Circulation across the southern boundary of the Atlantic. Also, the subtropical gyre exports salt and imports freshwater across the Atlantic's southern boundary, especially when freshwater from the Antarctic Ice Sheet arrives at the boundary of the basin. It appears that the response to Northern Hemisphere (NH) sources (the Greenland Ice Sheet) and Southern Hemisphere (SH) sources (the Antarctic Ice Sheet) are opposite. In the case of NH-only freshwater forcing, sea surface height (SSH) increases in the Arctic, causing a reduction of the SSH gradient over the Bering Strait, and hence the barotropic throughflow across the Arctic-Atlantic basin reduces. In case of SH-only freshwater forcing, SSH increases in the Pacific, enhancing the barotropic throughflow in the Arctic-Atlantic. When both NH and SH freshwater forcings are present, the response in the Atlantic is dominated by NH forcing. Changes in overturning transport to either NH or SH forcing counteract the response to changes in barotropic transport. These changes are not due to volume transport but mainly due to salinity changes, in particular across the southern boundary of the Atlantic. Only when both SH and NH freshwater forcing are present changes in barotropic transport and overturning transport reinforce each other: the barotropic transport more strongly reacts to NH forcing, while the overturning transport reacts more strongly to SH forcing. |
英文关键词 | Meltwater Atlantic Ocean Salinity budget Coupled climate models |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465441400011 |
WOS关键词 | FRESH-WATER ; BERING STRAIT ; THERMOHALINE CIRCULATION ; CLIMATE RESPONSE ; AGULHAS LEAKAGE ; SENSITIVITY ; MODEL ; WESTERLIES ; LOCATION ; SYSTEM |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182587 |
专题 | 气候变化 |
作者单位 | 1.Royal Netherlands Meteorol Inst, De Bilt, Netherlands; 2.Univ Southampton, Sch Ocean & Earth Sci, Southampton, Hants, England; 3.Wageningen Univ, Wageningen, Netherlands; 4.Netherlands eSci Ctr, Amsterdam, Netherlands |
推荐引用方式 GB/T 7714 | van den Berk, J.,Drijfhout, S. S.,Hazeleger, W.. Atlantic salinity budget in response to Northern and Southern Hemisphere ice sheet discharge[J]. CLIMATE DYNAMICS,2019,52:5249-5267. |
APA | van den Berk, J.,Drijfhout, S. S.,&Hazeleger, W..(2019).Atlantic salinity budget in response to Northern and Southern Hemisphere ice sheet discharge.CLIMATE DYNAMICS,52,5249-5267. |
MLA | van den Berk, J.,et al."Atlantic salinity budget in response to Northern and Southern Hemisphere ice sheet discharge".CLIMATE DYNAMICS 52(2019):5249-5267. |
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