@article{fdi:010069408,
  title = {{R}oles of land surface albedo and horizontal resolution on the {I}ndian summer monsoon biases in a coupled ocean-atmosphere tropical-channel model},
  author = {{S}amson, {G}. and {M}asson, {S}. and {D}urand, {F}abien and {T}erray, {P}ascal and {B}erthet, {S}. and {J}ullien, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {I}ndian summer monsoon ({ISM}) simulated over the 1989-2009 period with a new 0.75{A} degrees ocean-atmosphere coupled tropical-channel model extending from 45{A} degrees {S} to 45{A} degrees {N} is presented. {T}he model biases are comparable to those commonly found in coupled global climate models ({CGCM}s): the {F}indlater jet is too weak, precipitations are underestimated over {I}ndia while they are overestimated over the southwestern {I}ndian {O}cean, {S}outh-{E}ast {A}sia and the {M}aritime {C}ontinent. {T}he {ISM} onset is delayed by several weeks, an error which is also very common in current {CGCM}s. {W}e show that land surface temperature errors are a major source of the {ISM} low-level circulation and rainfall biases in our model: a cold bias over the {M}iddle-{E}ast ({ME}) region weakens the {F}indlater jet while a warm bias over {I}ndia strengthens the monsoon circulation over the southern {B}ay of {B}engal. {A} surface radiative heat budget analysis reveals that the cold bias is due to an overestimated albedo in this desertic {ME} region. {T}wo new simulations using a satellite-observed land albedo show a significant and robust improvement in terms of {ISM} circulation and precipitation. {F}urthermore, the {ISM} onset is shifted back by 1 month and becomes in phase with observations. {F}inally, a supplementary set of simulations at 0.25{A} degrees-resolution confirms the robustness of our results and shows an additional reduction of the warm and dry bias over {I}ndia. {T}hese findings highlight the strong sensitivity of the simulated {ISM} rainfall and its onset timing to the surface land heating pattern and amplitude, especially in the {ME} region. {I}t also illustrates the key-role of land surface processes and horizontal resolution for improving the {ISM} representation, and more generally the monsoons, in current {CGCM}s.},
  keywords = {{I}ndian summer monsoon ; {L}and surface albedo ; {H}orizontal resolution ; {P}recipitation biases ; {M}onsoon onset ; {CGCM} ; {OCEAN} {INDIEN} ; {ASIE}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {48},
  numero = {5-6},
  pages = {1571--1594},
  ISSN = {0930-7575},
  year = {2017},
  DOI = {10.1007/s00382-016-3161-0},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069408},
}