干旱区研究 ›› 2021, Vol. 38 ›› Issue (3): 650-664.doi: 10.13866/j.azr.2021.03.07

• 土壤资源 • 上一篇    下一篇

AMSR-E土壤水分产品评价及在干旱监测中的应用

王静1(),方锋2(),黄鹏程2,岳平1,李江萍3,王大为2   

  1. 1.中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室,甘肃 兰州730020
    2.兰州区域气候中心,甘肃 兰州730020
    3.兰州大学大气科学学院,甘肃 兰州730020
  • 收稿日期:2020-04-20 修回日期:2021-03-24 出版日期:2021-05-15 发布日期:2021-06-17
  • 通讯作者: 方锋
  • 作者简介:王静(1978-),女,副研究员,研究方向为气象灾害风险评估. E-mail: wangjing1102@126.com
  • 基金资助:
    中国气象局兰州干旱气象研究所创新团队建设项目(GHSCXTD-2020-3);甘肃省自然科学基金项目(20JR10RA454);甘肃省气象局气象科研项目(GSMArc2019-06);国家自然基金青年基金项目(41101422)

Evaluation of Advanced Microwave Scanning Radiometer for EOS(AMSR-E) soil moisture products over China and its application in drought monitoring

WANG Jing1(),FANG Feng2(),HUANG Pengcheng2,YUE Ping1,LI Jiangping3,WANG Dawei2   

  1. 1. Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration, Lanzhou 730020, Gansu, China
    2. Lanzhou Regional Climate Center, Lanzhou 730020, Gansu, China
    3. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730020, Gansu, China
  • Received:2020-04-20 Revised:2021-03-24 Online:2021-05-15 Published:2021-06-17
  • Contact: Feng FANG

摘要:

土壤水分在地表能量交换和气候变化中有重要作用。干旱为常见的自然灾害,土壤水分是反映干旱最直观的指标,利用微波遥感监测地表土壤水分具有明显优势,微波土壤水分产品也在干旱监测中具有重要作用,但由于地表下垫面的差异和反演算法的精度,使土壤水分产品的应用受到了限制,因此,本研究对广泛使用的AMSR-E (Advanced Microwave Scanning Radiometer-Earth Observing System)土壤水分产品在中国范围内的精度及在干旱监测中的作用进行评价。结果表明:AMSR-E能较好的反映站点不同深度的土壤水分情况,大多数站点存在极显著相关关系,但20 cm相关性低于10 cm,且高相关系数区域明显缩小;下垫面为白地的农试站观测的土壤水分和AMSR-E土壤水分产品之间的相关性显著高于种植作物下的农田区这2种数据的相关性;对于大多数下垫面类型,站点土壤水分和AMSR-E土壤水分之间存在明显的正相关关系,且达到极显著相关,对10 cm土壤水分观测,相关性最好的是种植高梁下观测的土壤水分,相关性达到了0.579,对20 cm土壤水分观测,相关性最好的是棉花下观测的土壤水分,相关性达到0.528。春季、夏季和秋季的相关性较高,而冬季相关性略低;在种植作物的情况下,东北、华南和西北地区,站点和AMSR-E土壤水分观测相关性较好,仅考虑白地的情况下,西北、西南和华中区域,这2种数据的相关性更高些;AMSR-E较农试站土壤水分取值范围宽,但不同区域AMSR-E土壤水分取值峰值不同,华北区域2种土壤水分观测分布和波动较为一致;AMSR-E基本能反映北方干旱和南方多雨引起的土壤水分差异趋势;大多数站点和大多数作物类型下,10 cm站点土壤水分和AMSR-E土壤水分相关性较好的情况下,20 cm也会有这样的表现。其次,AMSR-E土壤水分产品提取的土壤水分距平百分率与同期的降水距平百分率之间的相关性较好,尤其在西北地区和北方大部分区域更明显,AMSR-E土壤水分产品能较好的反映降水的波动和干旱的发生状况。

关键词: AMSR-E土壤水分产品, 土壤水分, 降水距平指数, 作物类型

Abstract:

Soil moisture plays an important role in surface energy exchange and climate change. Drought is a common natural disaster and soil moisture is the most intuitive index to reflect drought, therefore the use of microwave remote sensing to monitor surface soil moisture has obvious advantages. Microwave soil moisture products also play an important role in drought monitoring, but because of the difference of underlying surface and the accuracy of inversion algorithm, the application of soil moisture products is limited. Thus this study evaluated the accuracy of widely used AMSR-E (Advanced Microwave Scanning Radiometer for EOS) soil moisture products in china and their role in drought monitoring. The results showed that AMSR-E can better reflect the soil moisture at different depths, most of the sites have a very significant correlation, but the correlation of 20 cm is lower than 10 cm, and the high correlation coefficient area is significantly reduced; The correlation at bare soil between AMSR-E and agricultural meteorological station is significantly higher than that of farmland. For most crop regions, there are obvious relationships of soil moisture between agricultural meteorological station and AMSR-E. For 10 cm depth, the best correlation was observed under the planting sorghum with a coefficient of 0.579, while for 20 cm depth, the best correlation was under cotton with a coefficient of 0.528. The correlation of spring, summer and autumn was higher, but the correlation in winter was slightly lower. In the case of planting crops, the correlations of soil moisture between station and AMSR-E are better in Northeast, South and Northwest China, while in the case of white land those in Northwest, Southwest and Central China are higher; AMSR-E has a wider range of soil moisture values than the agricultural test station, but the peak values of AMSR-E are different in different regions, and the distribution and fluctuation of the two kinds of soil moisture in North China are relatively consistent; AMSR-E can basically reflect the trend of soil moisture difference caused by drought in the north and rainy in the south; For most stations and most crop types, if the correlation of 10 cm between agricultural meteorological station and AMSR-E is good, that of 20 cm soil moisture will also have this performance. Secondly, there is a good correlation between AMSR-E soil moisture anomaly percentage extracted by AMSR-E and precipitation anomaly percentage, especially in the northwest and most areas of northern China. AMSR-E soil moisture products can better reflect the fluctuation of precipitation and the occurrence of drought.

Key words: AMSR-E soil moisture, soil moisture, precipitation anomaly index, crop types