{"id":12118,"date":"2019-11-19T12:47:59","date_gmt":"2019-11-19T15:47:59","guid":{"rendered":"https:\/\/www.amazoniasocioambiental.org\/?p=12118"},"modified":"2019-11-19T12:48:14","modified_gmt":"2019-11-19T15:48:14","slug":"a-recent-systematic-increase-in-vapor-pressure-defcit-over-tropical-south-america","status":"publish","type":"post","link":"https:\/\/www.raisg.org\/en\/radar\/a-recent-systematic-increase-in-vapor-pressure-defcit-over-tropical-south-america\/","title":{"rendered":"A Recent Systematic Increase in Vapor Pressure Defcit over Tropical South America"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]<\/p>\n

Nature Research – Scientific Reports<\/strong><\/a><\/p>\n

Armineh Barkhordarian (1,2)*, Sassan S. Saatchi (2,3), <\/strong><\/p>\n

Ali Behrangi (4) PaulC. Loikith (5) & Carlos R. Mechoso (1)<\/strong><\/p>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]We show a recent increasing trend in Vapor Pressure Defcit (VPD) over tropical South America in dry
\nmonths with values well beyond the range of trends due to natural variability of the climate system
\ndefned in both the undisturbed Preindustrial climate and the climate over 850\u20131850 perturbed with
\nnatural external forcing. This trend is systematic in the southeast Amazon but driven by episodic
\ndroughts (2005, 2010, 2015) in the northwest, with the highest recoded VPD since 1979 for the
\n2015 drought. The univariant detection analysis shows that the observed increase in VPD cannot be
\nexplained by greenhouse-gas-induced (GHG) radiative warming alone. The bivariate attribution analysis
\ndemonstrates that forcing by elevated GHG levels and biomass burning aerosols are attributed as key
\ncauses for the observed VPD increase. We further show thatThere is a negative trend in evaporative
\nfraction in the southeast Amazon, where lack of atmospheric moisture, reduced precipitation together
\nwith higher incoming solar radiation (~7% decade\u22121 cloud-cover reduction) infuences the partitioning
\nof surface energy fuxes towards less evapotranspiration. The VPD increase combined with the decrease
\nin evaporative fraction are the frst indications of positive climate feedback mechanisms, which we
\nshow that will continue and intensify in the course of unfolding anthropogenic climate change.<\/p>\n

 <\/p>\n

(1) Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, USA. (2) Jet Propulsion
\nLaboratory, California Institute of Technology, Pasadena, USA. (3) Institute of Environment and Sustainability,
\nUniversity of California, Los Angeles, USA. (4) University of Arizona, Department of hydrology and atmospheric
\nsciences, Tucson, USA. (5) Portland State University, Department of Geography, Portland Oregon, USA. *email:
\nbarkhora@g.ucla.edu<\/h5>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]Read the article in PDF here: A Recent Systematic Increase in Vapor Pressure Defcit over Tropical South America<\/em><\/a><\/strong><\/p>\n

 <\/p>\n

https:\/\/www.nature.com\/articles\/s41598-019-51857-8<\/a>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text] Nature Research – Scientific Reports Armineh Barkhordarian (1,2)*, Sassan S. Saatchi (2,3), Ali Behrangi (4) PaulC. Loikith (5) & Carlos R. Mechoso (1) 25 October 2019 [\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]We show a recent increasing trend in Vapor Pressure Defcit (VPD) over tropical South America in dry months with values well beyond the range of trends due to…<\/p>\n","protected":false},"author":11,"featured_media":12113,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-12118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-radar","category-3","description-off"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/posts\/12118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/comments?post=12118"}],"version-history":[{"count":2,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/posts\/12118\/revisions"}],"predecessor-version":[{"id":12143,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/posts\/12118\/revisions\/12143"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/media\/12113"}],"wp:attachment":[{"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/media?parent=12118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/categories?post=12118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raisg.org\/en\/wp-json\/wp\/v2\/tags?post=12118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}