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CoSMOP - Global High-Resolution Time Series of Brightness Temperature from SMOS and SMAP-Enhanced

Lorenz, Christof and Montzka, Carsten and Jagdhuber, Thomas and Laux, Patrick and Kunstmann, Harald (2018) CoSMOP - Global High-Resolution Time Series of Brightness Temperature from SMOS and SMAP-Enhanced. [Other]

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Official URL: https://doi.pangaea.de/10.1594/PANGAEA.896154

Abstract

Long and consistent soil moisture time series at adequate spatial resolution are key to foster the application of soil moisture observations and remotely-sensed products in climate and numerical weather prediction models. The two L-band soil moisture satellite missions SMAP (Soil Moisture Active Passive) and SMOS (Soil Moisture and Ocean Salinity) are able to provide soil moisture estimates on global scales and in kilometer accuracy. However, the SMOS data record has an appropriate length of 7.5 years since late 2009, but with a coarse resolution of ∼25 km only. In contrast, a spatially-enhanced SMAP product is available at a higher resolution of 9 km, but for a shorter time period (since March 2015 only). Being the fundamental observable from passive microwave sensors, reliable brightness temperatures (Tbs) are a mandatory precondition for satellite-based soil moisture products. We therefore develop, evaluate and apply a copula-based data fusion approach for combining SMAP Enhanced (SMAP_E) and SMOS brightness Temperature (Tb) data. The approach exploits both linear and non-linear dependencies between the two satellite-based Tb products and allows one to generate conditional SMAP_E-like random samples during the pre-SMAP period. Our resulting global Copula-combined SMOS-SMAP_E (CoSMOP) Tbs are statistically consistent with SMAP_E brightness temperatures, have a spatial resolution of 9 km and cover the period from 2010 to 2018. Currently, the data contains only horizontally polarised retrievals from SMOS's and SMAP's ascending and descending nodes, respectively.

Item URL in elib:https://elib.dlr.de/132852/
Document Type:Other
Additional Information:Scientific Data, publicly accessible, https://doi.pangaea.de/10.1594/PANGAEA.896154
Title:CoSMOP - Global High-Resolution Time Series of Brightness Temperature from SMOS and SMAP-Enhanced
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lorenz, ChristofKIT Institute for Meteorology and Climate Research, Atmospheric Environmental ResearchUNSPECIFIED
Montzka, CarstenFZ JülichUNSPECIFIED
Jagdhuber, ThomasThomas.Jagdhuber (at) dlr.dehttps://orcid.org/0000-0002-1760-2425
Laux, PatrickKIT IMK-IFUUNSPECIFIED
Kunstmann, HaraldIMK-IFU GarmischUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1594/PANGAEA.896154
Status:Published
Keywords:SMAP,SMOS,Copula, brightness temperature
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Sicherheitsrelevante Erdbeobachtung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Jagdhuber, Dr Thomas
Deposited On:16 Dec 2019 11:06
Last Modified:09 Jan 2020 11:05

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