Estimation of surface albedo increase during the eighties Sahel drought from Meteosat observations

Govaerts, Yves; Lattanzio, A.

doi:10.1016/j.gloplacha.2008.04.004

Cited by 74 publications

(36 citation statements)

References 24 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There was strong inverse exponential relation with correlation (r = 0.95) between satellite observed albedo and observed gridded rainfall ( Figure 6). Similar relations were found out in West Africa between albedo and rainfall by several workers (Charney, 1977, Fuller et al 2002., Govaerts et al, 2008. This is the first time such an attempt has been made in India.…”

Section: Albedo-rainfall Couplingsupporting

confidence: 85%

Albedo-rainfall Feedback Over Indian Monsoon Region Using Long Term Observations Between 1981 to 2000

Bhattacharya

Gunjal

Panigrahy

et al. 2011

J Indian Soc Remote Sens

View full text Add to dashboard Cite

ABSTRACT:Albedo determines radiation balance of land (soil-canopy complex) surface and influence boundary layer structure of the atmosphere. Accurate surface albedo determination is important for weather forecasting, climate projection and ecosystem modelling. Albedo-rainfall feedback relationship has not been studied so far using observations on spatial scale over Indian monsoon region due to lack of consistent, systematic and simultaneous long-term measurements of both. The present study used tenday satellite (e.g. NOAA) based Pathfinder AVHRR Land (PAL) datasets between 1981 and 2000 over India (68-100°E, 5-40°N) at 8 km. Land surface albedo was computed using linear transformation of red and near infrared (NIR) surface reflectances. The cloud effects were removed using a smoothening filter with harmonic analysis applied to time series data in each year. The monthly, annual and long term means were computed from ten-day reconstructed albedo. The mean and coefficient of variation (CV) of surface albedo over seventeen years, averaged over Indian land region, were found to show a decreasing (0.15 to 0.14 and 39 to 34%, respectively) trend between 1981 and 2000. Further analysis showed that, among all the land use patterns, the inter-annual variation of albedo of Himalayan snow cover showed a prominent reducing trend (0.42 -0.35). This could be due to increase in snow melting period and snow melt area. The annual rainfall measured at IMD (India Meteorological Department) gauging stations, interpolated and averaged over 35×33 grids (1° x 1°) also show declining trend (1300 to 1150 mm) during this period, suggesting strong coupling between snow albedo and rainfall. A strong inverse exponential relation (correlation coefficient r=0.95, n=100) was found between annual rainfall and annual albedo over seven rainfall zones.

show abstract

Section: Albedo-rainfall Couplingsupporting

confidence: 85%

Albedo-rainfall Feedback Over Indian Monsoon Region Using Long Term Observations Between 1981 to 2000

Bhattacharya

Gunjal

Panigrahy

et al. 2011

J Indian Soc Remote Sens

View full text Add to dashboard Cite

show abstract

“…However, in addition to anthropogenic land use change, the natural vegetation conditions also present evidence of responding to the Sahel decadal rainfall variability. For instance, it has been shown that an increase in rainfall and the satellite derived Normalized Difference Vegetation Index (NDVI) over the northern edge of the WAM rain belt is associated with the recovery of the Sahel drought since the 1980s, when satellite data first became available (Anyamb and Tucker 2005;Herrmanna et al 2005;Jarlan et al 2005;Govaerts and Lattanzio 2008;Hiernaux et al 2009;Dardel et al 2014). The NDVI-derived leaf area index (LAI) shows similar trends (Song 2013).…”

Section: Discussionmentioning

confidence: 99%

West African monsoon decadal variability and surface-related forcings: second West African Monsoon Modeling and Evaluation Project Experiment (WAMME II)

et al. 2016

View full text Add to dashboard Cite

in the Sahel climate system at seasonal to decadal scales. The project's strategy is to apply prescribed observationally based anomaly forcing, i.e., "idealized but realistic" forcing, in simulations by climate models. The goal is to assess these forcings' effects in producing/amplifying seasonal and decadal climate variability in the Sahel between the 1950s and the 1980s, which is selected to characterize the great drought period of the last century. This is the first multi-model experiment specifically designed to simultaneously evaluate such relative contributions. The WAMME II models have consistently demonstrated that SST forcing is a major contributor to the twentieth century Sahel drought. Under the influence of the maximum possible SST forcing, the ensemble mean of WAMME II models can produce up to 60 % of the precipitation difference during the period. The present paper also addresses the role of SSTs Abstract The second West African Monsoon Modeling and Evaluation Project Experiment (WAMME II) is designed to improve understanding of the possible roles and feedbacks of sea surface temperature (SST), land use land cover change (LULCC), and aerosols forcings This paper is a contribution to the special issue on West African climate decadal variability and its modeling, consisting of papers from the West African Monsoon Modeling and Evaluation (WAMME) and the African Multidisciplinary Monsoon Analyses (AMMA) projects, and coordinated by Yongkang Xue, Serge Janicot, and William Lau. Provided Funding information has to be tagged. Electronic supplementary materialThe online version of this article (doi:10.1007/s00382-016-3224-2) contains supplementary material, which is available to authorized users. 3in triggering and maintaining the Sahel drought. In this regard, the consensus of WAMME II models is that both Indian and Pacific Ocean SSTs greatly contributed to the drought, with the former producing an anomalous displacement of the Intertropical Convergence Zone before the WAM onset, and the latter mainly contributes to the summer WAM drought. The WAMME II models also show that the impact of LULCC forcing on the Sahel climate system is weaker than that of SST forcing, but still of first order magnitude. According to the results, under LULCC forcing the ensemble mean of WAMME II models can produces about 40 % of the precipitation difference between the 1980s and the 1950s. The role of land surface processes in responding to and amplifying the drought is also identified. The results suggest that catastrophic consequences are likely to occur in the regional Sahel climate when SST anomalies in individual ocean basins and in land conditions combine synergistically to favor drought.Keywords Sahel seasonal and decadal climate variability · Sahel drought, SST and land forcings · GCM

show abstract

“…Clarke et al, 2012;Cornforth, 2013;Dube and Jury, 2000Green, 1993;Jager et al, 1998;Manatsa et al, 2008;O'Meagher et al, 1998;Richard et al, 2001;Unganai and Kogan, 1998;Vogel et al, 2010), Sahel (western Africa) (e.g. Giannini et al, 2008;Govaerts and Lattanzio, 2008;Kasei et al, 2010;Lebel et al, 2009;Lodoun et al, 2013;Traore and Fontane, 2007;Zeng, 2003), eastern Africa (Horn of Africa) (e.g. Anderson et al, 2012;Syroka and Nucifora, 2010) and northwestern Africa (e.g.…”

Section: Masih Et Al: a Review Of Droughts On The African Continementioning

confidence: 99%

A review of droughts on the African continent: a geospatial and long-term perspective

Masih

Maskey

Mussá

et al. 2014

Hydrol. Earth Syst. Sci.

539

250

View full text Add to dashboard Cite

Abstract. This paper presents a comprehensive review and analysis of the available literature and information on droughts to build a continental, regional and country level perspective on geospatial and temporal variation of droughts in Africa. The study is based on the review and analysis of droughts occurred during 1900-2013, as well as evidence available from past centuries based on studies on the lake sediment analysis, tree-ring chronologies and written and oral histories and future predictions from the global climate change models. Most of the studies based on instrumental records indicate that droughts have become more frequent, intense and widespread during the last 50 years. The extreme droughts of

show abstract

Estimation of surface albedo increase during the eighties Sahel drought from Meteosat observations

Cited by 74 publications

References 24 publications

Albedo-rainfall Feedback Over Indian Monsoon Region Using Long Term Observations Between 1981 to 2000

Albedo-rainfall Feedback Over Indian Monsoon Region Using Long Term Observations Between 1981 to 2000

West African monsoon decadal variability and surface-related forcings: second West African Monsoon Modeling and Evaluation Project Experiment (WAMME II)

A review of droughts on the African continent: a geospatial and long-term perspective

Contact Info

Product

Resources

About