Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis
High-latitude treeless ecosystems represent spatially highly heterogeneous landscapes with small net carbon fluxes and a short growing season. Reliable observations and process understanding are critical for projections of the carbon balance of the climate-sensitive tundra. Space-borne remote sensin...
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ftdatacite:10.25932/publishup-44620 2023-05-15T15:09:24+02:00 Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis Walther, Sophia Guanter, Luis Heim, Birgit Jung, Martin Duveiller, Gregory Wolanin, Aleksandra Sachs, Torsten 2020 application/pdf https://dx.doi.org/10.25932/publishup-44620 https://publishup.uni-potsdam.de/44620 en eng Universität Potsdam Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 550 Geowissenschaften 570 Biowissenschaften; Biologie article-journal Text ScholarlyArticle 2020 ftdatacite https://doi.org/10.25932/publishup-44620 2021-11-05T12:55:41Z High-latitude treeless ecosystems represent spatially highly heterogeneous landscapes with small net carbon fluxes and a short growing season. Reliable observations and process understanding are critical for projections of the carbon balance of the climate-sensitive tundra. Space-borne remote sensing is the only tool to obtain spatially continuous and temporally resolved information on vegetation greenness and activity in remote circumpolar areas. However, confounding effects from persistent clouds, low sun elevation angles, numerous lakes, widespread surface inundation, and the sparseness of the vegetation render it highly challenging. Here, we conduct an extensive analysis of the timing of peak vegetation productivity as shown by satellite observations of complementary indicators of plant greenness and photosynthesis. We choose to focus on productivity during the peak of the growing season, as it importantly affects the total annual carbon uptake. The suite of indicators are as follows: (1) MODIS-based vegetation indices (VIs) as proxies for the fraction of incident photosynthetically active radiation (PAR) that is absorbed (fPAR), (2) VIs combined with estimates of PAR as a proxy of the total absorbed radiation (APAR), (3) sun-induced chlorophyll fluorescence (SIF) serving as a proxy for photosynthesis, (4) vegetation optical depth (VOD), indicative of total water content and (5) empirically upscaled modelled gross primary productivity (GPP). Averaged over the pan-Arctic we find a clear order of the annual peak as APAR ≦ GPP : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1025 Text Arctic Tundra DataCite Metadata Store (German National Library of Science and Technology) Arctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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English |
topic |
550 Geowissenschaften 570 Biowissenschaften; Biologie |
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550 Geowissenschaften 570 Biowissenschaften; Biologie Walther, Sophia Guanter, Luis Heim, Birgit Jung, Martin Duveiller, Gregory Wolanin, Aleksandra Sachs, Torsten Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
topic_facet |
550 Geowissenschaften 570 Biowissenschaften; Biologie |
description |
High-latitude treeless ecosystems represent spatially highly heterogeneous landscapes with small net carbon fluxes and a short growing season. Reliable observations and process understanding are critical for projections of the carbon balance of the climate-sensitive tundra. Space-borne remote sensing is the only tool to obtain spatially continuous and temporally resolved information on vegetation greenness and activity in remote circumpolar areas. However, confounding effects from persistent clouds, low sun elevation angles, numerous lakes, widespread surface inundation, and the sparseness of the vegetation render it highly challenging. Here, we conduct an extensive analysis of the timing of peak vegetation productivity as shown by satellite observations of complementary indicators of plant greenness and photosynthesis. We choose to focus on productivity during the peak of the growing season, as it importantly affects the total annual carbon uptake. The suite of indicators are as follows: (1) MODIS-based vegetation indices (VIs) as proxies for the fraction of incident photosynthetically active radiation (PAR) that is absorbed (fPAR), (2) VIs combined with estimates of PAR as a proxy of the total absorbed radiation (APAR), (3) sun-induced chlorophyll fluorescence (SIF) serving as a proxy for photosynthesis, (4) vegetation optical depth (VOD), indicative of total water content and (5) empirically upscaled modelled gross primary productivity (GPP). Averaged over the pan-Arctic we find a clear order of the annual peak as APAR ≦ GPP : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1025 |
format |
Text |
author |
Walther, Sophia Guanter, Luis Heim, Birgit Jung, Martin Duveiller, Gregory Wolanin, Aleksandra Sachs, Torsten |
author_facet |
Walther, Sophia Guanter, Luis Heim, Birgit Jung, Martin Duveiller, Gregory Wolanin, Aleksandra Sachs, Torsten |
author_sort |
Walther, Sophia |
title |
Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
title_short |
Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
title_full |
Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
title_fullStr |
Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
title_full_unstemmed |
Assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
title_sort |
assessing the dynamics of vegetation productivity in circumpolar regions with different satellite indicators of greenness and photosynthesis |
publisher |
Universität Potsdam |
publishDate |
2020 |
url |
https://dx.doi.org/10.25932/publishup-44620 https://publishup.uni-potsdam.de/44620 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25932/publishup-44620 |
_version_ |
1766340608156237824 |