Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Diurnal Cycle of Convection over Lake Titicaca Basin Based on the Satellite Data from the Climate Prediction Center Morphing (CMORPH)

Version 1 : Received: 20 February 2020 / Approved: 23 February 2020 / Online: 23 February 2020 (16:14:28 CET)

How to cite: Chuchon Angulo, E.; Pereira Filho, A.J. Diurnal Cycle of Convection over Lake Titicaca Basin Based on the Satellite Data from the Climate Prediction Center Morphing (CMORPH). Preprints 2020, 2020020333 (doi: 10.20944/preprints202002.0333.v1). Chuchon Angulo, E.; Pereira Filho, A.J. Diurnal Cycle of Convection over Lake Titicaca Basin Based on the Satellite Data from the Climate Prediction Center Morphing (CMORPH). Preprints 2020, 2020020333 (doi: 10.20944/preprints202002.0333.v1).

Abstract

This paper examines the diurnal cycle of convection (DCC) over Lake Titicaca Basin (LTb) during summertime months based on the high spatial resolution (8 x 8 km2) and hourly temporal resolution, estimates of Climate Prediction Center Morphing technique (CMORPH). Analysis was performed using observed data from rain gauges (Rg-SENAMHI) for the period 2002 to 2013. Graphical comparisons and several statistical metrics such as correlation coefficient, bias, and root mean square error were used to evaluate CMORPH product. Spatial maps and graphic metrics of diurnal cycle were developed to assess CMORPH data, spatial dependency an accuracy over the LTb. Approximately, 43% of the total Rg-SENAMHI variation is explained CMORPH data. The correlation between Rg-SENAMHI and CMORPH is positively over southeast and northern LTb, and negatively in the central and southern LTb. A underestimation bias is observed over most the LTb areas and overestimation bias (e.g., Lagunillas, Isla Suana and Desaguadero stations). In general, spatial patterns of rainfall over the LTb were captured through CMORPH data. Over the surrounding lake area, high mountain, and plateau area, maximum peaks of precipitation occur in the early evening, neverhtheless over low areas such as the lake, surrounding and valleys, maximum precipitation values occur early morning. The results show that DCC its very related by surface exchange processes and local circulation resulting from solar radiation and heterogeneous topography.

Subject Areas

CMORPH; Diurnal cycle; Titicaca Lake basin

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