Status of desertification in the Patagonian region: Assessment and mapping from satellite imagery

Valle, Héctor F. del; Elissalde, Néstor O.; Gagliardini, Domingo A.; Milovich, J.

doi:10.1080/15324989809381502

Cited by 101 publications

(104 citation statements)

References 13 publications

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“…1) is an ideal site from which to develop a long-term record of atmospheric dust concentration. It is situated relatively near major dust-producing regions of southern South America, which have experienced significant desertification during the 20th century (31,32), and also is surrounded by ocean water and thus is distant from any significant local sources of dust.…”

Section: Resultsmentioning

confidence: 99%

20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America

McConnell

Aristarain

Banta

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

233

188

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Crustal dust in the atmosphere impacts Earth's radiative forcing directly by modifying the radiation budget and affecting cloud nucleation and optical properties, and indirectly through ocean fertilization, which alters carbon sequestration. Increased dust in the atmosphere has been linked to decreased global air temperature in past ice core studies of glacial to interglacial transitions. We present a continuous ice core record of aluminum deposition during recent centuries in the northern Antarctic Peninsula, the most rapidly warming region of the Southern Hemisphere; such a record has not been reported previously. This record shows that aluminosilicate dust deposition more than doubled during the 20th century, coincident with the Ϸ1°C Southern Hemisphere warming: a pattern in parallel with increasing air temperatures, decreasing relative humidity, and widespread desertification in Patagonia and northern Argentina. These results have far-reaching implications for understanding the forces driving dust generation and impacts of changing dust levels on climate both in the recent past and future.aluminosilicate dust ͉ global warming ͉ human impacts ͉ Patagonia ͉ radiative transfer C rustal dust in the atmosphere has a direct impact on climate forcing in two significant ways: modifying the radiation balance and affecting cloud nucleation and optical properties (1, 2). Atmospheric crustal dust also supplies iron, an essential nutrient for phytoplankton, to ocean surface waters and may indirectly affect climate by modulating the biological export of carbon to the deep ocean (3). Impacts of atmospheric dust on regional radiation budgets are similar in magnitude to those from sulfate and biomass burning aerosols (4) but can be either negative or positive (1). Estimates of the optical properties of dust have been revised recently as a result of improved in situ and remote sensing measurements (5, 6), but warming has been predicted across areas of high albedo (7, 8) such as snow-and ice-covered regions of the Antarctic Peninsula where recent warming has been pronounced (9). Although atmospheric dustiness has been linked to large-amplitude, large-scale temperature changes in past ice core studies of glacial to interglacial transitions (10, 11), it is unclear whether projected climate warming in coming decades to centuries will result in more or less atmospheric dust (12). Decadal changes in dust flux have been reported for ice cores from the Antarctic Peninsula (13, 14), but reliable, high-time-resolution records of changes in dust levels during recent decades and centuries are sparse (15).Ice core records offer the possibility of reconstructing past changes in dust concentration (10,11,(13)(14)(15)(16)(17)(18)(19)(20). Most previous high-resolution ice core studies used as proxies of atmospheric dust the non-sea-salt component of soluble calcium (nssCa) or magnesium (nssMg) that are computed by using estimated elemental ratios in sea salt aerosols (11,19). At many ice core sites, particularly coastal locations, the nssCa ...

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Section: Resultsmentioning

confidence: 99%

20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America

McConnell

Aristarain

Banta

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

233

188

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“…From Figure 1. Characterization of the study area: (A) location of Argentina (dark grey) and Santa Cruz province (black); (B) Desertification (black = none, very dark grey = slight degraded, dark grey = moderate desertification, grey = moderate to severe desertification, light grey = severe desertification, very light grey = very severe desertification [21]; (C) sample sites (black dots) and main water bodies in the zone of the Parcelas de Ecología y Biodiversidad de Ambientes Naturales en Patagonia Austral (PEBANPA) plots; (D) main ecological areas (light grey = dry steppe, grey = humid steppe, medium grey = shrub-lands, dark grey = sub-Andean grasslands, black = forests and alpine vegetation) [22].…”

Section: Soil Organic Carbonmentioning

confidence: 99%

“…The methods used to generate the GIS-derived independent variables were also described in Peri et al [3]. (4) (1) Hijmans et al [23]; (2) Consortium for Spatial Information (CSI) [24]; (3) Farr et al [25]; (4) SIT-Santa Cruz (http://www.sitsantacruz.gob.ar); (5) ORNL DAAC [26]; (6) Zhao et al [27]; (7) Del Valle et al [21].…”

Section: Gis-derived Independent Variablesmentioning

confidence: 99%

Modelling Soil Carbon Content in South Patagonia and Evaluating Changes According to Climate, Vegetation, Desertification and Grazing

et al. 2018

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Abstract:In Southern Patagonia, a long-term monitoring network has been established to assess bio-indicators as an early warning of environmental changes due to climate change and human activities. Soil organic carbon (SOC) content in rangelands provides a range of important ecosystem services and supports the capacity of the land to sustain plant and animal productivity. The objectives in this study were to model SOC (30 cm) stocks at a regional scale using climatic, topographic and vegetation variables, and to establish a baseline that can be used as an indicator of rangeland condition. For modelling, we used a stepwise multiple regression to identify variables that explain SOC variation at the landscape scale. With the SOC model, we obtained a SOC map for the entire Santa Cruz province, where the variables derived from the multiple linear regression models were integrated into a geographic information system (GIS). SOC stock to 30 cm ranged from 1.38 to 32.63 kg C m −2 . The fitted model explained 76.4% of SOC variation using as independent variables isothermality, precipitation seasonality and vegetation cover expressed as a normalized difference vegetation index. The SOC map discriminated in three categories (low, medium, high) determined patterns among environmental and land use variables. For example, SOC decreased with desertification due to erosion processes. The understanding and mapping of SOC in Patagonia contributes as a bridge across main issues such as climate change, desertification and biodiversity conservation.

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“…Dynamic information extraction and monitoring by remote sensing were used as early as three decades aboard. After 20 centuries 90's, there is a great progress in evaluate and monitor land degradation by remote sensing technology(Some book W. g. & sims D,1995;Valle H. F. De. et al,1998;Seixas J.,2002;Tripathy G. K, et al,1996;David Mount, et al,1997;Lambin E. F. & Strahler A. H.,1994;William G. Kepner, et al,2000).…”

Section: Application Of 3s Technologymentioning

confidence: 99%

A Review of Land Ecological Security Evaluation in China

Li¹,

Zeng²

2010

JGG

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Land ecological security evaluation is not only the core and foundation of land resources' sustainable utilization, but also the key reference of land planning, management and protection of decision-making. Research on land ecological security evaluation has become a hot field in the land ecological security problems since the late 1990s. Based on lots of references after comprehensive analysis, the study progress and achievement of land ecological security evaluation are discussed in 3 aspects which are evaluation scale, evaluation index and evaluation methods in domestic country, indicating the following main problems: a) The spatial scale evaluation is not deep and wide, and the time scale evaluation most for static evaluation. b) Construction of index system has strong subjectivity c) Innovation and the comparison is lacked between the evaluation methods. Finally, this paper put forward that dynamic evaluation, objective evaluation indexes, integrated evaluation methods will be the future trends in the field of land eco-security evaluation.

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Status of desertification in the Patagonian region: Assessment and mapping from satellite imagery

Cited by 101 publications

References 13 publications

20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America

20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America

Modelling Soil Carbon Content in South Patagonia and Evaluating Changes According to Climate, Vegetation, Desertification and Grazing

A Review of Land Ecological Security Evaluation in China

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