2017
Murray-Tortarolo, Guillermo; Jaramillo, Víctor J; Maass, Manuel; Friedlingstein, Pierre; Sitch, Stephen
The decreasing range between dry- and wet-season precipitation over land and its effect on vegetation primary productivity Journal Article
In: PLoS ONE, vol. 12, no. 12, pp. 1–11, 2017, ISSN: 19326203.
Abstract | Links | BibTeX | Tags: dry season length, Extreme climate events, NPP
@article{Murray-Tortarolo2017,
title = {The decreasing range between dry- and wet-season precipitation over land and its effect on vegetation primary productivity},
author = {Guillermo Murray-Tortarolo and Víctor J Jaramillo and Manuel Maass and Pierre Friedlingstein and Stephen Sitch},
doi = {10.1371/journal.pone.0190304},
issn = {19326203},
year = {2017},
date = {2017-01-01},
journal = {PLoS ONE},
volume = {12},
number = {12},
pages = {1--11},
abstract = {textcopyright 2017 Murray-Tortarolo et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. One consequence of climate change is the alteration of global water fluxes, both in amount and seasonality. As a result, the seasonal difference between dry- (p textless 100 mm/month) and wet-season (p textgreater 100 mm/month) precipitation (p) has increased over land during recent decades (1980–2005). However, our analysis expanding to a 60-year period (1950–2009) showed the opposite trend. This is, dry-season precipitation increased steadily, while wet-season precipitation remained constant, leading to reduced seasonality at a global scale. The decrease in seasonality was not due to a change in dry-season length, but in precipitation rate; thus, the dry season is on average becoming wetter without changes in length. Regionally, wet- and dry-season precipitations are of opposite sign, causing a decrease in the seasonal variation of the precipitation over 62% of the terrestrial ecosystems. Furthermore, we found a high correlation (r = 0.62) between the change in dry-season precipitation and the trend in modelled net primary productivity (NPP), which is explained based on different ecological mechanisms. This trend is not found with wet-season precipitation (r = 0.04), These results build on the argument that seasonal water availability has changed over the course of the last six decades and that the dry-season precipitation is a key driver of vegetation productivity at the global scale.},
keywords = {dry season length, Extreme climate events, NPP},
pubstate = {published},
tppubtype = {article}
}
textcopyright 2017 Murray-Tortarolo et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. One consequence of climate change is the alteration of global water fluxes, both in amount and seasonality. As a result, the seasonal difference between dry- (p textless 100 mm/month) and wet-season (p textgreater 100 mm/month) precipitation (p) has increased over land during recent decades (1980–2005). However, our analysis expanding to a 60-year period (1950–2009) showed the opposite trend. This is, dry-season precipitation increased steadily, while wet-season precipitation remained constant, leading to reduced seasonality at a global scale. The decrease in seasonality was not due to a change in dry-season length, but in precipitation rate; thus, the dry season is on average becoming wetter without changes in length. Regionally, wet- and dry-season precipitations are of opposite sign, causing a decrease in the seasonal variation of the precipitation over 62% of the terrestrial ecosystems. Furthermore, we found a high correlation (r = 0.62) between the change in dry-season precipitation and the trend in modelled net primary productivity (NPP), which is explained based on different ecological mechanisms. This trend is not found with wet-season precipitation (r = 0.04), These results build on the argument that seasonal water availability has changed over the course of the last six decades and that the dry-season precipitation is a key driver of vegetation productivity at the global scale.
2016
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
The dry season intensity as a key driver of NPP trends Journal Article
In: Geophysical Research Letters, vol. 43, no. 6, pp. 2632–2639, 2016, ISSN: 19448007.
Abstract | Links | BibTeX | Tags: drought, dry season length, land carbon cycle
@article{Murray-Tortarolo2016a,
title = {The dry season intensity as a key driver of NPP trends},
author = {Guillermo Murray-Tortarolo and Pierre Friedlingstein and Stephen Sitch and Sonia I Seneviratne and Imogen Fletcher and Brigitte Mueller and Peter Greve and Alessandro Anav and Yi Liu and Anders Ahlström and Chris Huntingford and Sam Levis and Peter Levy and Mark Lomas and Benjamin Poulter and Nicholas Viovy and Sonke Zaehle and Ning Zeng},
doi = {10.1002/2016GL068240},
issn = {19448007},
year = {2016},
date = {2016-01-01},
journal = {Geophysical Research Letters},
volume = {43},
number = {6},
pages = {2632--2639},
abstract = {textcopyright2016. American Geophysical Union. All Rights Reserved. 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.},
keywords = {drought, dry season length, land carbon cycle},
pubstate = {published},
tppubtype = {article}
}
textcopyright2016. American Geophysical Union. All Rights Reserved. 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.
