English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/8721
Title: Surface temperature cooling trends and negative radiative forcing due to land use change toward greenhouse farming in southeastern Spain
Authors: Campra, Pablo; García García, Mónica; Cantón, Yolanda; Palacios-Orueta, Alicia
Keywords: Climate change
Radiative forcing
Land use change
Greenhouse farming
Temperature trends
Issue Date: 23-Sep-2008
Publisher: American Geophysical Union
Citation: Journal of Geophysical Research 113: D18109 (2008)
Abstract: Greenhouse horticulture has experienced in recent decades a dramatic spatial expansion in the semiarid province of Almeria, in southeastern (SE) Spain, reaching a continuous area of 26,000 ha in 2007, the widest greenhouse area in the world. A significant surface air temperature trend of −0.3°C decade−1 in this area during the period 1983–2006 is first time reported here. This local cooling trend shows no correlation with Spanish regional and global warming trends. Radiative forcing (RF) is widely used to assess and compare the climate change mechanisms. Surface shortwave RF (SWRF) caused through clearing of pasture land for greenhouse farming development in this area is estimated here. We present the first empirical evidences to support the working hypothesis of the development of a localized forcing created by surface albedo change to explain the differences in temperature trends among stations either inside or far from this agricultural land. SWRF was estimated from satellite-retrieved surface albedo data and calculated shortwave outgoing fluxes associated with either uses of land under typical incoming solar radiation. Outgoing fluxes were calculated from Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data. A difference in mean annual surface albedo of +0.09 was measured comparing greenhouses surface to a typical pasture land. Strong negative forcing associated with land use change was estimated all year round, ranging from −5.0 W m−2 to −34.8 W m−2, with a mean annual value of −19.8 W m−2. According to our data of SWRF and local temperatures trends, recent development of greenhouse horticulture in this area may have masked local warming signals associated to greenhouse gases increase.
Description: 10 pages, 6 figures.-- Open Access full-text version available at the publisher's site.
Index Terms: 1632 Global Change: Land cover change; 1631 Global Change: Land/atmosphere interactions; 0402 Biogeosciences: Agricultural systems; 1640 Global Change: Remote sensing; 3329 Atmospheric Processes: Mesoscale meteorology.
Publisher version (URL): http://dx.doi.org/10.1029/2008JD009912
URI: http://hdl.handle.net/10261/8721
ISSN: 0148-0227
DOI: 10.1029/2008JD009912
Appears in Collections:(EEZA) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.