Error Characteristics of Microwave Soil Moisture Products based on Triple Collocation and Its Spatial-temporal Pattern

Yue Fan; Jianxiu Qiu; Jianzhi Dong; Xiaohu Zhang; Dagang Wang

doi:10.11873/j.issn.1004-0323.2020.1.0085

Remote Sensing Technology and Application 鈥衡�� 2020, Vol. 35 鈥衡�� Issue (1): 85-96.DOI: 10.11873/j.issn.1004-0323.2020.1.0085

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Error Characteristics of Microwave Soil Moisture Products based on Triple Collocation and Its Spatial-temporal Pattern

Yue Fan^1,^2,³(),Jianxiu Qiu^1,^2,³(),Jianzhi Dong⁴,Xiaohu Zhang⁵,Dagang Wang^1,^2,³

^1.Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
^2.Key Laboratory of Mineral Resource & Geological Processes of Guangdong Province, Guangzhou 510275, China
^3.Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, China
^4.USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD20705-2350 USA
^5.National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China

Received:2019-12-20 Revised:2020-01-17 Online:2020-04-01 Published:2020-02-20
Contact: Jianxiu Qiu

鍩轰簬Triple Collocation鏂规硶鐨勫井娉㈠湡澹ゆ按鍒嗕骇鍝佷笉纭畾鎬у垎鏋愪笌鏃剁┖鍙樺寲瑙勫緥鐮旂┒

鑼冩偊^1,^2,³(),閭卞缓绉�^1,^2,³(),钁ｅ缓蹇�⁴,寮犲皬铏�⁵,鐜嬪ぇ鍒�^1,^2,³

^1.涓北澶у鍦扮悊绉戝涓庤鍒掑闄� 骞夸笢鐪佸煄甯傚寲涓庡湴鐞嗙幆澧冪┖闂存ā鎷熼噸鐐瑰疄楠屽锛屽箍涓� 骞垮窞 510275
^2.骞夸笢鐪佸湴璐ㄨ繃绋嬩笌鐭夸骇璧勬簮鎺㈡煡閲嶇偣瀹為獙瀹わ紝骞夸笢骞垮窞 510275
^3.鍗楁柟娴锋磱绉戝涓庡伐绋嬪箍涓滅渷瀹為獙瀹�(鐝犳捣)锛屽箍涓� 鐝犳捣 519000
^4.缇庡浗鍐滀笟閮� 姘存枃閬ユ劅瀹為獙瀹わ紝椹噷鍏板窞 20705
^5.鍗椾含鍐滀笟澶у鍥藉淇℃伅鍐滀笟宸ョ▼鎶�鏈腑蹇� 鍗椾含鍐滀笟澶у, 姹熻嫃鍗椾含 210095

閫氳浣滆��: 閭卞缓绉�
浣滆�呯畝浠�:鑼� 鎮�(1994-)锛屽コ锛岄噸搴嗗紑宸炰汉锛岀澹爺绌剁敓锛屼富瑕佷粠浜嬮仴鎰熷湡澹ゆ按鍒嗕骇鍝侀獙璇佺爺绌躲�侲?mail锛�fany26@mail2.sysu.edu.cn銆�
鍩洪噾璧勫姪:
鍥藉鑷劧绉戝鍩洪噾闈笂椤圭洰(41971031);鍥藉鑷劧绉戝鍩洪噾闈掑勾椤圭洰(41501450)

Abstract

Abstract:

Soil moisture is an important state variable connecting the land surface-atmosphere system, and its information can be efficiently acquired by the new technique of microwave remote sensing. Accurate interpretation of the microwave soil moisture products qualities and in-depth understanding of their temporal and spatial distributions are important prerequisites for their successful application in earth science through data assimilation. In this study, three microwave soil moisture products, FengYun-3C(FY-3C), Soil Moisture Active Passive (SMAP) and Advanced Scatterometer(ASCAT), were evaluated over China based on the triple collocation (TC) method. The abilities of three products to obtain temporal and spatial variations of soil moisture were illustrated by Hovm?ller diagram. The results show that: (1) SMAP generally outperforms ASCAT and FY-3C, with highest TC-based signal-to-noise ratio(SNR) under different land use types. The TC-based SNRs are 1.668dB, -0.316dB and -2.182dB for SMAP, ASCAT and FY-3C respectively; and their correlation coefficients with ground observations are 0.514, 0.501 and 0.209, respectively. (2) The accuracies of FY-3C and ASCAT in Northwest China are overall higher than those in the southern China. All three products can capture the latitudinal and longitudinal gradients of soil moisture, whereas their seasonal fluctuations are higher than those of in-situ measurements. Among three products, FY-3C shows highest spatial gradient and strongest seasonal fluctuations. (3) FY-3C product performance is more susceptible to vegetation coverage than ASCAT and SMAP, but it outperforms ASCAT in barren areas. The results of our study could provide useful insights for assimilating microwave soil moisture products into land surface models to improve hydrological prediction.

Key words: FengYun 3C, SMAP, ASCAT, Triple Collocation, Soil moisture

鎽樿锛�

鍦熷￥姘村垎鏄繛鎺ュ湴鈥旀皵绯荤粺鐨勯噸瑕佺姸鎬佸彉閲忥紝寰尝閬ユ劅涓哄噯纭幏鍙栧ぇ闈㈢Н鍦熷￥姘村垎淇℃伅鎻愪緵鏂扮殑鎶�鏈墜娈点�傚噯纭В璇诲井娉㈠湡澹ゆ按鍒嗕骇鍝佽川閲忋�佹繁鍏ヤ簡瑙ｅ叾璇樊鐨勬椂绌哄垎甯冪壒寰佹槸閫氳繃鏁版嵁鍚屽寲绛夋柟娉曞皢鍏惰瀺鍏ラ檰闈㈡ā鍨�,浠庤�屾垚鍔熷簲鐢ㄤ簬鍦扮悆绉戝棰嗗煙鐨勯噸瑕佸厛鍐虫潯浠躲�傚熀浜嶵riple Collocation(TC)鏂规硶妫�楠屼簡椋庝簯涓夊彿C鏄�(FY-3C)銆佸湡澹ゆ按鍒嗕富琚姩鍗槦(SMAP)鍙婇珮绾у井娉㈡暎灏勮(ASCAT)杩�3绉嶅父鐢ㄥ井娉㈠湡澹ゆ按鍒嗕骇鍝佸湪涓浗闄嗗煙鐨勮川閲忥紝骞堕�氳繃Hovm?ller鍥捐瘎浼颁簡3濂椾骇鍝佹崟鎹夊湡澹ゆ按鍒嗘椂绌哄彉鍖栫殑鑳藉姏銆傜粨鏋滄樉绀猴細鈶燭C鏂规硶寰楀埌鐨勫垎鏋愮粨璁轰笌鍦伴潰瀹炴祴璧勬枡鐨勯獙璇佺粨鏋滀竴鑷达紝鏁翠綋涓奡MAP浼樹簬ASCAT鍜孎Y-3C锛屼笉鍚屽湡鍦板埄鐢ㄧ被鍨嬩笅SMAP淇″櫔姣斿潎鏈�楂橈紝涓夎�呯殑TC淇″櫔姣斿垎鍒负1.668 dB銆�-0.316 dB鍜�-2.182 dB锛屽悓鏃朵笁鑰呬笌瀹炴祴鍊肩殑鐩稿叧绯绘暟鍒嗗埆涓�0.514銆�0.501鍜�0.209锛涒憽FY-3C鍜孉SCAT浜у搧鐨勭簿搴﹀湪涓浗瑗垮寳鍦板尯鏁翠綋浼樹簬鍗楅儴鍦板尯锛�3绉嶄骇鍝佸潎鑳借緝濂藉湴鍒荤敾鍦熷￥姘村垎闅忕含搴﹀拰缁忓害鍙樺寲鐨勬儏鍐碉紝3绉嶄骇鍝佸睍鐜扮殑瀛ｈ妭娉㈠姩鏁翠綋楂樹簬瀹炴祴锛屽叾涓璅Y-3C鐨勫鑺傛尝鍔ㄥ湪3绉嶄骇鍝佷腑鏈�涓哄墽鐑堬紱鈶Y-3C鐨勮川閲忔瘮ASCAT鍜孲MAP鏇存槗鍙楀埌妞嶈褰卞搷锛屼絾鍦ㄨ８鍦熷尯FY-3C浼樹簬ASCAT銆傛湰鐮旂┒鍩轰簬TC鍒嗘瀽鎻愪緵浜嗗叏鍥借寖鍥村唴3绉嶄富娴佸井娉㈠湡澹ゆ按鍒嗕骇鍝佺殑璇樊鍜屼俊鍣瘮鐨勭┖闂村垎甯冿紝骞堕�氳繃Hovm?ller鍥捐瘎浼颁簡鍏舵弿杩板湡澹ゆ按鍒嗘椂绌哄彉鍖栫殑鑳藉姏銆傜爺绌剁粨璁哄彲涓哄井娉㈠湡澹ゆ按鍒嗕骇鍝佺殑鍚屽寲鐮旂┒鎻愪緵涓�瀹氬弬鑰冦��

鍏抽敭璇�: 椋庝簯涓夊彿, SMAP, ASCAT, Triple Collocation, 鍦熷￥姘村垎

CLC Number:

TP75

Yue Fan,Jianxiu Qiu,Jianzhi Dong,Xiaohu Zhang,Dagang Wang. Error Characteristics of Microwave Soil Moisture Products based on Triple Collocation and Its Spatial-temporal Pattern[J]. Remote Sensing Technology and Application, 2020, 35(1): 85-96.

鑼冩偊,閭卞缓绉�,钁ｅ缓蹇�,寮犲皬铏�,鐜嬪ぇ鍒�. 鍩轰簬Triple Collocation鏂规硶鐨勫井娉㈠湡澹ゆ按鍒嗕骇鍝佷笉纭畾鎬у垎鏋愪笌鏃剁┖鍙樺寲瑙勫緥鐮旂┒[J]. 閬ユ劅鎶�鏈笌搴旂敤, 2020, 35(1): 85-96.

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Error Characteristics of Microwave Soil Moisture Products based on Triple Collocation and Its Spatial-temporal Pattern

鍩轰簬Triple Collocation鏂规硶鐨勫井娉㈠湡澹ゆ按鍒嗕骇鍝佷笉纭畾鎬у垎鏋愪笌鏃剁┖鍙樺寲瑙勫緥鐮旂┒

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