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Article

The Summertime Diurnal Cycle of Precipitation Derived from IMERG

1
Earth Observation Science Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
2
National Centre for Earth Observation, University of Leicester, Leicester LE1 7RH, UK
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(15), 1781; https://0-doi-org.brum.beds.ac.uk/10.3390/rs11151781
Received: 20 June 2019 / Revised: 21 July 2019 / Accepted: 26 July 2019 / Published: 30 July 2019
(This article belongs to the Special Issue Precipitation and Water Cycle Measurements Using Remote Sensing)
The Integrated Multi-satellitE Retrievals for GPM (IMERG) precipitation product derived from the Global Precipitation Measurement (GPM) constellation offers a unique opportunity of observing the diurnal cycle of precipitation in the latitudinal band 60 ° N–S at unprecedented 0.1 ° × 0.1 ° and half-hour resolution. The diurnal cycles of occurrence, intensity and accumulation are determined using four years of data at 2 ° × 2 ° resolution; this study focusses on summertime months when the diurnal cycle shows stronger features. Harmonics are fitted to the diurnal cycle using a non-linear least squares method weighted by random errors. Results suggest that mean-to-peak amplitudes for the diurnal cycles of occurrence and accumulation are greater over land (generally larger than 25% of the diurnal mean), where the diurnal harmonic dominates and peaks at ~16–24 LST, than over ocean (generally smaller than 25%), where the diurnal and semi-diurnal harmonics contribute comparably. Over ocean, the diurnal harmonic peaks at ~0–10 LST (~8–15 LST) over open waters (coastal waters). For intensity, amplitudes of the diurnal and semi-diurnal harmonics are generally comparable everywhere (~15–35%) with the diurnal harmonic peaking at ~20–4 LST (~3–12 LST) over land (ocean), and the semi-diurnal harmonic maximises at ~5–8 LST and 17–20 LST. The diurnal cycle of accumulation is dictated by occurrence as opposed to intensity. View Full-Text
Keywords: diurnal cycle; satellite precipitation; IMERG; global; summertime diurnal cycle; satellite precipitation; IMERG; global; summertime
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MDPI and ACS Style

Watters, D.; Battaglia, A. The Summertime Diurnal Cycle of Precipitation Derived from IMERG. Remote Sens. 2019, 11, 1781. https://0-doi-org.brum.beds.ac.uk/10.3390/rs11151781

AMA Style

Watters D, Battaglia A. The Summertime Diurnal Cycle of Precipitation Derived from IMERG. Remote Sensing. 2019; 11(15):1781. https://0-doi-org.brum.beds.ac.uk/10.3390/rs11151781

Chicago/Turabian Style

Watters, Daniel, and Alessandro Battaglia. 2019. "The Summertime Diurnal Cycle of Precipitation Derived from IMERG" Remote Sensing 11, no. 15: 1781. https://0-doi-org.brum.beds.ac.uk/10.3390/rs11151781

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