同化CryoSat-2干舷以改进北极海冰厚度估计

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-09-01 DOI:10.5194/tc-17-3721-2023
Imke Sievers, T. Rasmussen, L. Stenseng
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引用次数: 1

摘要

摘要在本研究中,提出了一种新的方法来同化从卫星雷达测高得到的干舷(FB),目的是改善北极海冰厚度预测的初始状态。为了量化同化海冰厚度所获得的改善,我们比较了三种不同的模型运行:一个参考运行(refRun),一个只同化海冰浓度(SIC) (sicRun),一个同时同化SIC和FB (fbRun)。结果表明,同化可以改善SIC和FB的估计,但只有fbRun可以改善FB。通过比较波弗特环流探测项目(BGEP)的海冰draft测量结果和北极气候研究多学科漂流观测站(MOSAiC)考察期间部署的19个冰质量平衡(IMB)浮标的海冰厚度测量结果,得出了海冰厚度的评估结果。fbRun的海冰厚度与较长的BGEP观测值相比优于refRun和sicRun,但与较短的MOSAiC观测值相比差。此外,将三个模式运行与Alfred Wegener研究所(AWI)每周CryoSat-2海冰厚度进行比较,后者基于与本研究中吸收的相同的FB观测结果。结果表明,与refRun和sicRun相比,fbRun的FB和海冰厚度更接近于AWI CryoSat-2的值。最后,将上述观测结果与fbRun海冰厚度和AWI每周CryoSat-2海冰厚度进行比较。在BGEP位置,fbRun和AWI的CryoSat-2海冰厚度表现相同。两个海冰厚度产品在BGEP位置的总均方根误差(RMSE)为30 cm。在MOSAiC位置,fbRun的海冰厚度表现明显更好,RMSE降低了11 cm。
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Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates
Abstract. In this study, a new method to assimilate freeboard (FB) derived from satellite radar altimetry is presented with the goal of improving the initial state of sea ice thickness predictions in the Arctic. In order to quantify the improvement in sea ice thickness gained by assimilating FB, we compare three different model runs: one reference run (refRun), one that assimilates only sea ice concentration (SIC) (sicRun), and one that assimilates both SIC and FB (fbRun). It is shown that estimates for both SIC and FB can be improved by assimilation, but only fbRun improved the FB. The resulting sea ice thickness is evaluated by comparing sea ice draft measurements from the Beaufort Gyre Exploration Project (BGEP) and sea ice thickness measurements from 19 ice mass balance (IMB) buoys deployed during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. The sea ice thickness of fbRun compares better than refRun and sicRun to the longer BGEP observations more poorly to the shorter MOSAiC observations. Further, the three model runs are compared to the Alfred Wegener Institute (AWI) weekly CryoSat-2 sea ice thickness, which is based on the same FB observations as those that were assimilated in this study. It is shown that the FB and sea ice thickness from fbRun are closer to the AWI CryoSat-2 values than the ones from refRun or sicRun. Finally, comparisons of the abovementioned observations and both the fbRun sea ice thickness and the AWI weekly CryoSat-2 sea ice thickness were performed. At the BGEP locations, both fbRun and the AWI CryoSat-2 sea ice thickness perform equally. The total root-mean-square error (RMSE) at the BGEP locations equals 30 cm for both sea ice thickness products. At the MOSAiC locations, fbRun's sea ice thickness performs significantly better, with a total 11 cm lower RMSE.
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来源期刊
Cryosphere
Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.70
自引率
17.30%
发文量
240
审稿时长
4-8 weeks
期刊介绍: The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.
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