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The dry season intensity as a key driver of NPP trends

Geophysical research letters, 2016-03, Vol.43 (6), p.2632-2639 [Peer Reviewed Journal]

2016. American Geophysical Union. All Rights Reserved. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0094-8276 ;ISSN: 1944-8007 ;EISSN: 1944-8007 ;DOI: 10.1002/2016GL068240

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Title:
The dry season intensity as a key driver of NPP trends
Author: Murray‐Tortarolo, Guillermo ; Friedlingstein, Pierre ; Sitch, Stephen ; Seneviratne, Sonia I. ; Fletcher, Imogen ; Mueller, Brigitte ; Greve, Peter ; Anav, Alessandro ; Liu, Yi ; Ahlström, Anders ; Huntingford, Chris ; Levis, Sam ; Levy, Peter ; Lomas, Mark ; Poulter, Benjamin ; Viovy, Nicholas ; Zaehle, Sonke ; Zeng, Ning
Subjects: Asymmetry ; Atmospheric precipitations ; Availability ; Biomass ; Carbon cycle ; Climate ; Climate change ; Climate Research ; Continental interfaces, environment ; Correlation ; drought ; Dry season ; dry season length ; dry season length land carbon cycle drought 0428 Carbon cycling 1630 Impacts of global change 1655 Water cycles 1615 Biogeochemical cycles, processes, and modeling 1616 Climate variability ; Drying ; Earth and Related Environmental Sciences ; Ecosystems ; Fluxes ; Geovetenskap och miljövetenskap ; Klimatforskning ; land carbon cycle ; Length ; Moisture content ; Natural Sciences ; Naturvetenskap ; Net Primary Productivity ; Ocean, Atmosphere ; Precipitation ; Primary production ; Productivity ; Products ; Rainfall ; Rainy season ; Sciences of the Universe ; Seasons ; Trends ; Vegetation ; Water availability ; Wet season
Is Part Of: Geophysical research letters, 2016-03, Vol.43 (6), p.2632-2639
Description: We analyze the impacts of changing dry season length and intensity on vegetation productivity and biomass. Our results show a wetness asymmetry in dry ecosystems, with dry seasons becoming drier and wet seasons becoming wetter, likely caused by climate change. The increasingly intense dry seasons were consistently correlated with a decreasing trend in net primary productivity (NPP) and biomass from different products and could potentially mean a reduction of 10–13% in NPP by 2100. We found that annual NPP in dry ecosystems is particularly sensitive to the intensity of the dry season, whereas an increase in precipitation during the wet season has a smaller effect. We conclude that changes in water availability over the dry season affect vegetation throughout the whole year, driving changes in regional NPP. Moreover, these results suggest that usage of seasonal water fluxes is necessary to improve our understanding of the link between water availability and the land carbon cycle. Key Points We show that the dry season has become more intense over the arid regions in recent decades We find a linear relationship between such increased intensity and a decrease in NPP. The trend is predicted to continue over the future, reducing global NPP between 10 and 13% by 2100
Publisher: Washington: John Wiley & Sons, Inc
Language: English;Swedish
Identifier: ISSN: 0094-8276
ISSN: 1944-8007
EISSN: 1944-8007
DOI: 10.1002/2016GL068240
Source: Hyper Article en Ligne (HAL) (Open Access)
Wiley Blackwell AGU Digital Library
Alma/SFX Local Collection

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The dry season intensity as a key driver of NPP trends

2016. American Geophysical Union. All Rights Reserved. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0094-8276 ;ISSN: 1944-8007 ;EISSN: 1944-8007 ;DOI: 10.1002/2016GL068240

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