How representative are FLUXNET measurements of surface fluxes during temperature extremes?
In response to a warming climate, temperature extremes are changing in many regions of the world. Therefore, understanding how the fluxes of sensible heat, latent heat and net ecosystem exchange respond and contribute to these changes is important. We examined 216 sites from the open access Tier 1 F...
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Copernicus Publications
2019
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Online Access: | http://hdl.handle.net/1959.4/unsworks_57940 https://unsworks.unsw.edu.au/bitstreams/ce5e3eaa-4979-4e87-9e2e-32921325d7d4/download https://doi.org/10.5194/bg-16-1829-2019 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_57940 2024-05-19T07:31:17+00:00 How representative are FLUXNET measurements of surface fluxes during temperature extremes? Van Der Horst, SVJ Pitman, AJ De Kauwe, MG Ukkola, A Abramowitz, G Isaac, P 2019-04-30 application/pdf http://hdl.handle.net/1959.4/unsworks_57940 https://unsworks.unsw.edu.au/bitstreams/ce5e3eaa-4979-4e87-9e2e-32921325d7d4/download https://doi.org/10.5194/bg-16-1829-2019 unknown Copernicus Publications http://purl.org/au-research/grants/arc/CE170100023 http://hdl.handle.net/1959.4/unsworks_57940 https://unsworks.unsw.edu.au/bitstreams/ce5e3eaa-4979-4e87-9e2e-32921325d7d4/download https://doi.org/10.5194/bg-16-1829-2019 open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read urn:ISSN:1726-4170 urn:ISSN:1726-4189 Biogeosciences, 16, 8, 1829-1844 13 Climate Action anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences journal article http://purl.org/coar/resource_type/c_6501 2019 ftunswworks https://doi.org/10.5194/bg-16-1829-2019 2024-05-01T00:04:40Z In response to a warming climate, temperature extremes are changing in many regions of the world. Therefore, understanding how the fluxes of sensible heat, latent heat and net ecosystem exchange respond and contribute to these changes is important. We examined 216 sites from the open access Tier 1 FLUXNET2015 and free fair-use La Thuile data sets, focussing only on observed (non-gap-filled) data periods. We examined the availability of sensible heat, latent heat and net ecosystem exchange observations coincident in time with measured temperature for all temperatures, and separately for the upper and lower tail of the temperature distribution, and expressed this availability as a measurement ratio. We showed that the measurement ratios for both sensible and latent heat fluxes are generally lower (0.79 and 0.73 respectively) than for temperature measurements, and the measurement ratio of net ecosystem exchange measurements are appreciably lower (0.42). However, sites do exist with a high proportion of measured sensible and latent heat fluxes, mostly over the United States, Europe and Australia. Few sites have a high proportion of measured fluxes at the lower tail of the temperature distribution over very cold regions (e.g. Alaska, Russia) or at the upper tail in many warm regions (e.g. Central America and the majority of the Mediterranean region), and many of the world's coldest and hottest regions are not represented in the freely available FLUXNET data at all (e.g. India, the Gulf States, Greenland and Antarctica). However, some sites do provide measured fluxes at extreme temperatures, suggesting an opportunity for the FLUXNET community to share strategies to increase measurement availability at the tails of the temperature distribution. We also highlight a wide discrepancy between the measurement ratios across FLUXNET sites that is not related to the actual temperature or rainfall regimes at the site, which we cannot explain. Our analysis provides guidance to help select eddy covariance sites for researchers ... Article in Journal/Newspaper Antarc* Antarctica Greenland Alaska UNSW Sydney (The University of New South Wales): UNSWorks Biogeosciences 16 8 1829 1844 |
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Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences |
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13 Climate Action anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences Van Der Horst, SVJ Pitman, AJ De Kauwe, MG Ukkola, A Abramowitz, G Isaac, P How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
topic_facet |
13 Climate Action anzsrc-for: 04 Earth Sciences anzsrc-for: 05 Environmental Sciences anzsrc-for: 06 Biological Sciences |
description |
In response to a warming climate, temperature extremes are changing in many regions of the world. Therefore, understanding how the fluxes of sensible heat, latent heat and net ecosystem exchange respond and contribute to these changes is important. We examined 216 sites from the open access Tier 1 FLUXNET2015 and free fair-use La Thuile data sets, focussing only on observed (non-gap-filled) data periods. We examined the availability of sensible heat, latent heat and net ecosystem exchange observations coincident in time with measured temperature for all temperatures, and separately for the upper and lower tail of the temperature distribution, and expressed this availability as a measurement ratio. We showed that the measurement ratios for both sensible and latent heat fluxes are generally lower (0.79 and 0.73 respectively) than for temperature measurements, and the measurement ratio of net ecosystem exchange measurements are appreciably lower (0.42). However, sites do exist with a high proportion of measured sensible and latent heat fluxes, mostly over the United States, Europe and Australia. Few sites have a high proportion of measured fluxes at the lower tail of the temperature distribution over very cold regions (e.g. Alaska, Russia) or at the upper tail in many warm regions (e.g. Central America and the majority of the Mediterranean region), and many of the world's coldest and hottest regions are not represented in the freely available FLUXNET data at all (e.g. India, the Gulf States, Greenland and Antarctica). However, some sites do provide measured fluxes at extreme temperatures, suggesting an opportunity for the FLUXNET community to share strategies to increase measurement availability at the tails of the temperature distribution. We also highlight a wide discrepancy between the measurement ratios across FLUXNET sites that is not related to the actual temperature or rainfall regimes at the site, which we cannot explain. Our analysis provides guidance to help select eddy covariance sites for researchers ... |
format |
Article in Journal/Newspaper |
author |
Van Der Horst, SVJ Pitman, AJ De Kauwe, MG Ukkola, A Abramowitz, G Isaac, P |
author_facet |
Van Der Horst, SVJ Pitman, AJ De Kauwe, MG Ukkola, A Abramowitz, G Isaac, P |
author_sort |
Van Der Horst, SVJ |
title |
How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
title_short |
How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
title_full |
How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
title_fullStr |
How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
title_full_unstemmed |
How representative are FLUXNET measurements of surface fluxes during temperature extremes? |
title_sort |
how representative are fluxnet measurements of surface fluxes during temperature extremes? |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
http://hdl.handle.net/1959.4/unsworks_57940 https://unsworks.unsw.edu.au/bitstreams/ce5e3eaa-4979-4e87-9e2e-32921325d7d4/download https://doi.org/10.5194/bg-16-1829-2019 |
genre |
Antarc* Antarctica Greenland Alaska |
genre_facet |
Antarc* Antarctica Greenland Alaska |
op_source |
urn:ISSN:1726-4170 urn:ISSN:1726-4189 Biogeosciences, 16, 8, 1829-1844 |
op_relation |
http://purl.org/au-research/grants/arc/CE170100023 http://hdl.handle.net/1959.4/unsworks_57940 https://unsworks.unsw.edu.au/bitstreams/ce5e3eaa-4979-4e87-9e2e-32921325d7d4/download https://doi.org/10.5194/bg-16-1829-2019 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read |
op_doi |
https://doi.org/10.5194/bg-16-1829-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
8 |
container_start_page |
1829 |
op_container_end_page |
1844 |
_version_ |
1799469126536658944 |