Publication Date:
2021-09-23
Description:
Recent climatic studies for the dominantly rain-fed agricultural U.S. Corn Belt (CB) suggest an influence of land use/land cover (LULC) spatial differences on convective development, set within the larger-scale (synoptic) atmospheric conditions of pressure, winds, and vertical motion. However, the potential role of soil moisture (SM) in the LULC association with atmospheric humidity, horizontal wind and convective precipitation (CVP) has received more limited attention, mostly as modeling studies or empirical analyses for regions non-analogous to the CB. Accordingly, we determine the categorical associations between SM and the near-surface atmospheric humidity (q), with 850-hPa horizontal wind (V850) at four representative CB locations for the nine warm-seasons of 2011-2019. Recurring configurations of joint SM-q-V850 conducive to CVP are then identified and stratified into three phenologically distinct sub-seasons (early, middle, late).We show that the stations show some statistical similarity in their SM-CVP relationships. Corn Belt CVP occurs preferentially with high humidity and southerly winds sometimes comprising a low-level jet (LLJ), particularly on early-season days having low SM and late-season days having high SM. Additionally, mid-season CVP days having weaker V850 (i.e., non-LLJ) tend to be associated with medium SM values and high humidity. Conversely, late-season CVP days are frequently characterized by high values of both SM and humidity. These empirical results are likely explained by the inferred sensible and latent heat fluxes varying according to SM content and LULC type. They provide a basis for future mesoscale modeling studies of Corn Belt SM and CVP interactions to test the hypothesized physical processes.
Print ISSN:
1558-8424
Electronic ISSN:
1558-8432
Topics:
Geography
,
Physics
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