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Validation of the TIMELINE AVHRR Land Surface Temperature (LST) Product with MODIS and in situ LST

Asam, Sarah and Reiners, Philipp and Frey, Corinne and Sobrino, Jose and Göttsche, Frank-Joachim and Bendix, Jörg and Künzer, Claudia (2019) Validation of the TIMELINE AVHRR Land Surface Temperature (LST) Product with MODIS and in situ LST. ESA Living Planet Symposium 2019, 2019-05-13 - 2019-05-17, Mailand, Italien.

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Land Surface Temperature (LST) is an important quantity describing the interface between long- and shortwave radiation fluxes on one side and turbulent heat fluxes and the ground heat flux on the other side. Therefore, it is a useful parameter for tracing the impact of changing climatic conditions on our environment. Satellite derived LST are an indispensable tool for monitoring these changes consistently over large areas and for detecting long term trends and patterns. Thermal Infrared (TIR) data from the AVHRR (Advanced Very High Resolution Radiometer) sensors on NOAA-satellites are operationally available since the early 1980s at 1 km spatial resolution. Several algorithms exist to derive LST from top of atmosphere brightness temperatures, which requires accounting for the attenuation due to of water vapor and for effects from land surface emissivity and sensor degradation. In the TIMELINE project (www.timeline.dlr.de), one aim is to retrieve accurate and consistent LST for the entire operating period of AVHRR sensors over Europe using the approach created by Frey et al. (2017) based on the Qin et al. (2001) and Becker & Li (1990) algorithms. In this study we present the validation results for the TIMELINE AVHRR LST product as well as preliminary analyses of patterns and trends in this multi-decadal data set. The validation approach consists of the following steps: a) an assessment of the consistency of the AVHRR LST time series between the different NOAA missions; b) an inter-comparison between AVHRR LST and in-situ LST obtained at 11 stations located in Europe (Evora, Donana), North America (7 surface radiation network (SURFRAD) stations) and Southern Africa (Gobabeb, Heimat); and c) a comparison of the AVHRR LST product to concurrent MODIS (Moderate Resolution Imaging Spectroradiometer) LST (MOD21 product). The comparisons were conducted on a daily basis for five different years (2000, 2010 - 2013). Only pixels satisfying a certain homogeneity criteria were selected. Furthermore, a maximum time difference of 10 minutes between AVHRR and MODIS acquisitions and in situ LST was permitted according to the suggestions from the CEOS LST Product Validation Best Practice Protocol. In total, 4000 in situ measurements and 1000 MODIS scenes were compared to the AVHRR LST product values. First results indicate a successful derivation of stable LST time series from multi- decadal AVHRR data. The comparison between the TIMELINE LST product and the selected data sets show diurnal and annual patterns as well as differences for individual land cover types. For 2010, on average, an absolute deviation of the AVHRR LST by 1.5 K from in situ LST as well as a difference of in average 1.5 K from the MODIS product was observed.

Item URL in elib:https://elib.dlr.de/129323/
Document Type:Conference or Workshop Item (Poster)
Title:Validation of the TIMELINE AVHRR Land Surface Temperature (LST) Product with MODIS and in situ LST
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Asam, SarahUNSPECIFIEDhttps://orcid.org/0000-0002-7302-6813UNSPECIFIED
Frey, CorinneUNSPECIFIEDhttps://orcid.org/0000-0002-9879-9732UNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:AVHRR Land Surface Temperature, MODIS, time series, Europe
Event Title:ESA Living Planet Symposium 2019
Event Location:Mailand, Italien
Event Type:international Conference
Event Start Date:13 May 2019
Event End Date:17 May 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Remote Sensing and Geo Research
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface Dynamics
Deposited By: Asam, Dr. Sarah
Deposited On:08 Oct 2019 09:43
Last Modified:24 Apr 2024 20:32

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