摘要
使用卫星遥感技术进行全球范围的降水观测已成为当前热点。然而,热带海岛地区因其气候特殊和地形复杂,遥感降水数据的精度评估尚未充分研究。文章以海南岛为研究区,利用小时尺度的站点数据对CMORPH、CHIRPS、GsMAP、GPM、MSWEP、ERA5-Land和PERSIANN进行多尺度系统评估,分析各类产品在该区域的降水探测能力。结果表明:1)相比于其他5种降水产品,GsMAP和GPM在不同时间尺度上均具有更优表现,相关性强,误差小,对各级降水的探测成功率较高。在3 h尺度上,GPM和GsMAP的相关系数分别为0.53和0.52;在日尺度上,GPM和GsMAP的相关系数分别为0.73和0.74。2)在年降水量对比中,过去20年海南岛的年平均降水量呈现波动中变化趋势,平均值为1776.4 mm/a。CMORPH的年平均值为1765.1 mm/a,与CHM-PRE数据集最为接近,误差较小。3)在空间分布格局研究中,GsMAP的降水量范围为1337.9~2287.0 mm,与站点观测数据(996.9~2368.9 mm)最为接近,呈现东部多于西部,西南山区多于东北平原的环状分布格局,尤其在海南岛东南部的高值中心区域,二者较吻合。4)在降水趋势分析中,CMORPH、ERA5-Land、GPM、MSWEP、CHIRPS和PERSIANN在海南岛部分地区呈现增加趋势,而GsMAP呈现较为强烈的增加趋势。5)在极端降水事件分析中,GPM能较好地模拟海南岛台风降水事件的时空演变特征。因此,在开展海南岛降水研究工作时,GsMAP和GPM是比较合适的选择。
Global precipitation observations have been realized through the development of satellite remotesensing technology.However,there is a lack of evaluation of remote-sensing precipitation products in complex tropical island terrains.This study used hourly rain gauge data to conduct a multi-scale systematic evaluation of common precipitation products,such as CMORPH,CHIRPS,GsMAP,GPM,MSWEP,ERA5-Land,and PERSIANN,over Hainan Island,providing an in-depth analysis of the precipitation detection capabilities of various products in this region.The main conclusions are:(1)In a multi-temporal scale evaluation,GPM and GsMAP outperformed the other products across all time scales.On a 3-hour scale,GPM and GsMAP showed the highest correlation coefficients(0.53 and 0.52,respectively).On a daily scale,except for PERSIANN,all products showed correlation coefficients above 0.56,with GPM and GsMAP showing the best performance(R=0.73 and 0.74,respectively).(2)In comparing annual precipitation,Hainan Island's average-annual precipitation over the past 20 years showed a fluctuating trend,with a mean of 1,776.4 mm/a.The CMORPH annual average of 1,765.1 mm/a was the closest to the CHM-PRE dataset,with minimal error.ERA5-Land and MSWEP significantly overestimated(2,504.3 mm/a)and underestimated(1,662.2 mm/a)the average-annual precipitation,respectively.(3)Spatial distribution pattern analysis revealed that the observed multi-year annual precipitation in Hainan Island ranges from 996.9 to 2,368.9 mm,exhibiting an annular-distribution pattern with higher precipitation in the east than in the west and the southwestern mountainous areas than in the northeastern plains.The precipitation range of 1,337.9‒2,287.0 mm observed in GsMAP was the closest to the rain gauge data and particularly matched that of the high-value center in the southeast of the island.(4)In a precipitation trend analysis,CMORPH,ERA5-Land,GPM,MSWEP,CHIRPS,and PERSIANN showed an increasing trend in local areas of Hainan Island,while GsMAP showed a stronger increasing trend.(5
作者
李世禧
廖玮杰
尚明
郭建超
施晨晓
杨岳
白磊
Li Shixi;Liao Weijie;Shang Ming;Guo Jianchao;Shi Chenxiao;Yang Yue;Bai Lei(College of Ecology,Hainan University,Haikou 570228,China;Center for Eco-Environment Restoration Engineering of Hainan Province,Hainan University,Haikou 570228,China;School of Earth Science and Engineering,Hebei University of Engineering,Handan 056038,China;Hainan Province Water Conservancy and Hydropower Survey,Design and Research Institute,Haikou 570203,China;Hainan Meteorological Information Center,Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China)
出处
《热带地理》
CSCD
北大核心
2024年第9期1588-1601,共14页
Tropical Geography
基金
海南省重点研发专项(ZDYF2022SHFZ042)
国家自然科学基金(32260294)
高原与盆地暴雨旱涝灾害四川省重点实验室开放研究基金项目
海南大学科研基金资助项目[KYQD(ZR)-22083]
关键词
时空格局
极端降水事件
气候变化
多尺度
海南岛
spatial-temporal patterns
extreme precipitation events
climate change
multi-scale
Hainan Island
