Soil moisture-constrained East Asian Monsoon meridional patterns over China from observations

Abstract As an internal forcing of the earth climate system, soil moisture (SM) significantly influences water and energy cycle by controlling evapotranspiration terrestrial solar energy. The current study used observed precipitation, remotely sensed SM, reanalysis atmosphere land parameters to assess East Asian Monsoon (EAM) precipitation variability due meridional SM oscillations across China. A generalized linear method, namely coupled manifold technique (CMT) for assessing reciprocal between two fields numerical simulations are applied EAM precipitation. We find that interannual north south China correlates with oscillation. CMT results further showed has a significant (99% confidence) influence on explaining about 0.40 variance ratio in composite analysis show wetter (drier) (south) oscillates over vice versa thermal controls. then control sensitivity observations validate findings implying can potentially improve forecast skills. model negative (positive) sensible heat (latent heat) anomalies impact boundary layer propagate change atmospheric heating profile. When positive (negative) exist northern (southern) China, zonal easterlies extratropical westerlies move causing above-normal descends into southern suppressing subtropical On contrary, dry (wet) favors intensified have dire implications region projected wetting drying patterns (south).