SWOT卫星海面高自交叉点不符值及其影响因素分析

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中图分类号：P414.4 文献标志码：A 文章编号：1002-4026（2025）03-0034-06

开放科学（资源服务）标志码（OSID）

Analysis of self-crossover discrepancies in observed sea surface height

using SWOT satellites and influencing factors

DENG Yanfen， ZHANG Xiaojie， JIANG Yunyun，ZHAO Jianli（East China Sea Survey Center，Ministry of Natural Resources， Shanghai 2O0137，China）

Abstract： Using Level-2 low-rateexpert-level data obtained from the Surface Water and Ocean Topography（SWOT） satelites，thisstudycalculatesthe positionsofcrossoverpointsusinga gridding method，quantitativelyanalyzesselfcrossover discrepancies，andinvestigates theimpactsof various factors—thetime diference betweenthecrossover points，crossover distance，distance fromthe coast，and latitude—on these discrepancies.Results show thatinmost regions，discrepancies fall within the range of -0.2m to 0.2m ，indicating good data consistency，although notable discrepanciesare observed in specificregions.Further analysis reveals thatthe distance betweenthecrossover points has a minimalimpact on discrepancies；discrepancies near thecoastline arerelatively dispersed，whilethose observed in regionsfartherfromthecoastlinetendtodecreaseandstabilize.Inhigh-latituderegions，discrepanciesdecrease.Thetime difference shows acertain degree of dispersion in its influence on discrepancies.In a certain range（within 2km ），the distancebetweenthecrossverpointshasaminimal impact ondiscrepancies.The findingsof thisstudy providea

scientific basis for improving the accuracyand reliability of altimetry data obtained from SWOT satelites. Keywords ： surface water and ocean topography satelite；self-crossover discrepancies; latitude;timediffrence

海面高度数据是理解和预测全球水文循环、海平面变化及其对气候变化影响的关键参数[1-3]。（剩余7829字）