Sea State Bias Variability in Satellite Altimetry Data

Sea State Bias Variability in Satellite Altimetry Data
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卫星测高数据中的海况偏差变化

DOI:
10.3390/rs11101176
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发表时间:
2019-05
期刊:
影响因子:
5
通讯作者:
Liu Ting
Liu Ting
中科院分区:
工程技术2区
文献类型:
--
作者:
Cheng Yongcun;Xu Qing;Gao Le;Li Xiaofeng;Zou Bin;Liu Ting

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海状态偏差 (SSB) 会导致全球平均海平面变化,并且由于仪器随时间的漂移,需要进行厘米级范围调整。为了研究其变化并精确校正全球和区域海平面趋势,我们分别计算了 TOPEX、Jason-1、Jason-2 和 Jason-3 任务以及 1993-2017 年期间组合任务中 SSB 校正的时空变化。全球平均业务二维非参数SSB修正的长期趋势约为-0.03±0.03毫米/年,占1993-2016年当前全球平均海平面变化率的1%。这一修正导致 TOPEX-A 和 Jason-2 任务中的海平面变化率分别为 -1.27 ± 0.21 毫米/年和 -0.26 ± 0.13 毫米/年。在 1997-1998 年和 2015-2016 年非常强的 ENSO 事件期间,全球平均 SSB 变化高达 7-10 毫米。此外,TOPEX SSB 趋势与最近报告的 1993-1998 年海平面趋势漂移一致,可能会渗透到该时期确定的全球海平面趋势中。此外,Jason-1/2 纬向 SSB 变异性与有效波高 (SWH) 高度相关。就纬向平均而言,SSB 修正导致平均海平面趋势约 1% 的不确定性。在高 SWH 区域,在 50°N 和 60°S 频段附近,不确定性增加到 2-4%。在研究区域海平面变化时应考虑这一点。
Sea State Bias (SSB) contributes to global mean sea level variability and it needs cm-level range adjustment due to the instrumental drift over time. To investigate its variations and correct the global and regional sea level trend precisely, we calculate the temporal and spatial variability of the SSB correction in TOPEX, Jason-1, Jason-2 and Jason-3 missions, separately, as well as in the combined missions over the period 1993–2017. The long-term trend in global mean operational 2D non-parametric SSB correction is about −0.03 ± 0.03 mm/yr, which accounts for 1% of current global mean sea level change rate during 1993–2016. This correction contributes to sea level change rates of −1.27 ± 0.21 mm/yr and −0.26 ± 0.13 mm/yr in TOPEX-A and Jason-2 missions, respectively. The global mean SSB varies up to 7–10 mm during the very strong ENSO events in 1997–1998 and 2015–2016. Furthermore, the TOPEX SSB trend, which is consistent with recently reported sea level trend drift during 1993–1998, may leak into the determined global sea level trend in the period. Moreover, the Jason-1/2 zonal SSB variability is highly correlated with the significant wave height (SWH). On zonal average, SSB correction causes about 1% uncertainty in mean sea level trend. At high SWH regions, the uncertainties grow to 2–4% near the 50°N and 60°S bands. This should be considered in the study of regional sea level variability.
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