气候变化领域集成服务门户(CCPortal): Revisiting the contemporary sea-level budget on global and regional scales

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DOI	10.1073/pnas.1519132113
	Revisiting the contemporary sea-level budget on global and regional scales
	Rietbroek R.; Brunnabend S.-E.; Kusche J.; Schröter J.; Dahle C.
发表日期	2016
ISSN	0027-8424
起始页码	1504
结束页码	1509
卷号	113 期号:6
英文摘要	Dividing the sea-level budget into contributions from ice sheets and glaciers, the water cycle, steric expansion, and crustal movement is challenging, especially on regional scales. Here, Gravity Recovery And Climate Experiment (GRACE) gravity observations and sea-level anomalies from altimetry are used in a joint inversion, ensuring a consistent decomposition of the global and regional sea-level rise budget. Over the years 2002-2014, we find a global mean steric trend of 1.38 ± 0.16 mm/y, compared with a total trend of 2.74 ± 0.58 mm/y. This is significantly larger than steric trends derived from in situ temperature/salinity profiles and models which range from 0.66 ± 0.2 to 0.94 ± 0.1 mm/y. Mass contributions from ice sheets and glaciers (1.37 ± 0.09 mm/y, accelerating with 0.03 ± 0.02 mm/y2) are offset by a negative hydrological component (-0.29 ± 0.26 mm/y). The combined mass rate (1.08 ± 0.3 mm/y) is smaller than previous GRACE estimates (up to 2 mm/y), but it is consistent with the sum of individual contributions (ice sheets, glaciers, and hydrology) found in literature. The altimetric sea-level budget is closed by coestimating a remaining component of 0.22 ± 0.26 mm/y. Well above average sea-level rise is found regionally near the Philippines (14.7 ±4.39 mm/y) and Indonesia (8.3 ± 4.7 mm/y) which is dominated by steric components (11.2 ± 3.58 mm/y and 6.4 ± 3.18 mm/y, respectively). In contrast, in the central and Eastern part of the Pacific, negative steric trends (down to -2.8 ± 1.53 mm/y) are detected. Significant regional components are found, up to 5.3 ± 2.6 mm/y in the northwest Atlantic, which are likely due to ocean bottom pressure variations.
英文关键词	Altimetry; Budget; GRACE; Sea level; Steric
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158908
作者单位	Rietbroek, R., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, D-53115, Germany; Brunnabend, S.-E., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, D-53115, Germany, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, D-27570, Germany; Kusche, J., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, D-53115, Germany; Schröter, J., Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, D-27570, Germany; Dahle, C., GFZ German Research Centre for Geosciences, Potsdam, D-14473, Germany
推荐引用方式 GB/T 7714	Rietbroek R.,Brunnabend S.-E.,Kusche J.,et al. Revisiting the contemporary sea-level budget on global and regional scales[J],2016,113(6).
APA	Rietbroek R.,Brunnabend S.-E.,Kusche J.,Schröter J.,&Dahle C..(2016).Revisiting the contemporary sea-level budget on global and regional scales.Proceedings of the National Academy of Sciences of the United States of America,113(6).
MLA	Rietbroek R.,et al."Revisiting the contemporary sea-level budget on global and regional scales".Proceedings of the National Academy of Sciences of the United States of America 113.6(2016).