Dust　deposition　is　a　crucial　link　of　dust　cycle　that　is　less　constrained　in　model　studies.　This　study　acquired　profiles　of　flux　and　size　distribution　of　daily　dustfall　from　2012　to　2013　in　Xi＇an　on　the　southern　Chinese　Loess　Plateau.　On　this　basis,　we　made　quantitative　estimates　of　dust　contribution　from　particular　sources　and　processes,　which　provides　important　boundary　conditions　for　model　studies.　Regrouping　the　data　into　transport-　and　source-limited　deposition　scenarios,　we　revealed　that　besides　precipitation　extreme　wind　speed　and　average　relative　humidity　are　the　primary　meteorological　constraints　in　the　transport　and　source-limited　scenarios,　respectively.　Stronger　extreme　wind　speed　promotes　higher　flux　and　deposition　of　dust　＞16　mu　m,　corroborating　previous　interpretations　of　variation　of　flux　and　grain　size　of　aeolian　deposits.　However,　higher　average　relative　humidity　favors　lower　flux　and　deposition　of　dust　＜16　mu　m,　which　is　a　deposition　process　not　recognized　before,　and　is　possibly　due　to　hygroscopicity　of　mineral　dust　or　the　influence　of　water　vapor　on　air　convection.　Elucidating　this　process　in　future　studies　might　substantially　improve　model　performance　on　dust　deposition.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.