@article{fdi:010047187,
  title = {{A}nalysis of the in situ and {MODIS} albedo variability at multiple time scales in the {S}ahel - art. no. {D}14119},
  author = {{S}amain, {O}. and {K}ergoat, {L}. and {H}iernaux, {P}. and {G}uichard, {F}. and {M}ougin, {E}ric and {T}imouk, {F}ranck and {L}avenu, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he variability of the {S}ahelian albedo is investigated through the combined analysis of 5 years of in situ radiation data from the {A}frican {M}onsoon {M}ultidisciplinary {A}nalysis northernmost sites and remotely sensed albedo from 7 years of {M}oderate {R}esolution {I}maging {S}pectroradiometer data. {B}oth data sets are found to be in good agreement in terms of correlation and bias. {T}he drivers of albedo variability are identified by means of in situ measurements of biological and physical properties of the land surface collected over a network of 29 long-term survey sites. {S}hort-term variability is dominated by changes in the spectral composition of incident radiation, which reflects aerosol optical depth and integrated water content, and changes in soil moisture, which have a short-lived effect (1 d). {B}ush fires cause a marked decrease of albedo of the order of 10 d, whereas a dry season storm event is suspected to have increased albedo through litter and soil surface abrasion. {S}easonal plant growth causes the largest changes in rainy season albedo, and displays a large interannual variability: {B}ecause of the 2004 drought, albedo increases steadily from late 2003 to early 2005 at latitude 15 degrees {N}. {G}razing pressure is found to impact albedo mostly in the dry season. {D}ry season albedo is controlled by the amount of litter and standing dead phytomass hiding the bright soils. {T}hus rainfall anomalies have a direct effect on albedo through plant growth but also a lagged effect caused by above normal amounts of dry phytomass that can persist until the arrival of the next monsoon. {EOF} analysis and {H}ovmuller diagrams show these effects to be present on a large scale.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch-{A}tmospheres},
  volume = {113},
  numero = {{D}14},
  pages = {{D}14119 (16 )},
  ISSN = {0148-0227},
  year = {2008},
  DOI = {10.1029/2007{JD}009174},
  URL = {https://www.documentation.ird.fr/hor/fdi:010047187},
}