Ocean Rainfall And Ice-phase precipitation measurement Network - OceanRAIN-M

Klepp, Christian; Michel, Simon; Protat, Alain; Burdanowitz, Jörg; Albern, Nicole; Louf, Valentin; Bakan, Stephan; Dahl, Andrea; Thiele, Tanja

doi:10.1594/wdcc/oceanrain-m

Cited by 5 publications

(2 citation statements)

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“…In total, 126,533 DSD measurements in the OceanRAIN database are available for our analysis. OceanRAIN data are publicly available through the website http://www.oceanrain.org/ and the World Data Center for Climate (data referenced as Klepp et al, 2017).…”

Section: Data Sets and Methodsmentioning

confidence: 99%

The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 2. The Relationships Between Radar Observables and Drop Size Distribution Parameters

et al. 2019

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In this study, we develop statistical relationships between radar observables and drop size distribution properties in different latitude bands to inform radar rainfall retrieval techniques and understand underpinning microphysical reasons for differences reported in the literature between satellite mean zonal rainfall products at high latitudes (up to a factor 2 between products over ocean). A major assumption in satellite retrievals is the attenuation‐reflectivity relationships for convective and stratiform precipitation. They are found to systematically produce higher attenuation than our relationships with all latitudes included or within individual latitude bands (except in the tropics). The scatter around fitted curves approximating the radar reflectivity‐mass‐weighted diameter Dm relationship and the dual‐frequency ratio (ratio of Ka‐ to Ku‐band reflectivities)‐Dm relationships is found to be large and of the same magnitude. This result suggests that the added value of two radar frequencies to improve the Dm retrieval from space seems limited. In contrast, the relationship between Dm and the attenuation/reflectivity ratio is robust and not dependent on latitude. Direct relationships between rainfall and either reflectivity or attenuation are also found to be very robust. Attenuation‐reflectivity, Dm‐reflectivity, and rainfall rate‐reflectivity relationships in the Southern Hemisphere high latitude and Northern Hemisphere polar latitude bands are fundamentally different from those at other latitude bands, producing smaller attenuation, much larger Dm, and lower rainfall rates. This implies that specific relationships need to be used for these latitude bands in radar rainfall retrieval techniques using such relationships.

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Section: Data Sets and Methodsmentioning

confidence: 99%

The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 2. The Relationships Between Radar Observables and Drop Size Distribution Parameters

et al. 2019

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“…OceanRAIN data are publicly available through the website http://www. oceanrain.org/ and the World Data Center for Climate (data referenced as Klepp et al 2017a, Klepp et al, 2017b.…”

Section: Introductionmentioning

confidence: 99%

The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 1. Drop Size Distribution Properties

et al. 2019

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In this study, we analyze an in situ shipboard global ocean drop size distribution (DSD) 8‐year database to understand the underpinning microphysical reasons for discrepancies between satellite oceanic rainfall products at high latitudes reported in the literature. The natural, latitudinal, and convective‐stratiform variability of the DSD is found to be large, with a substantially lower drop concentration with diameter smaller than 3 mm in the Southern hemisphere high latitude (S‐highlat, south of 45°S) and Northern Hemisphere polar latitude (N‐polar, north of 67.5°S) bands, which is where satellite rainfall products most disagree. In contrast, the latitudinal variability of the normalized oceanic DSD is small, implying that the functional form of the normalized DSD can be assumed constant and accurately parameterized using proposed fits. The S‐highlat and N‐polar latitude bands stand out as regions with oceanic rainfall properties different from other latitudes, highlighting fundamental differences in rainfall processes at different latitudes and associated specific challenges for satellite rainfall retrieval techniques. The most salient differences in DSD properties between these two regions and the other latitude bands are: (1) a systematically higher (lower) frequency of occurrence of rainfall rates below (above) 1 mm h‐1, (2) much lower drop concentrations, (3) very different values of the DSD shape parameter (μ0) from what is currently assumed in satellite radar rainfall algorithms, and (4) very different DSD properties in both the convective and stratiform rainfall regimes. Overall, this study provides insights into how DSD assumptions in satellite radar rainfall retrieval techniques could be refined.

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OceanRAIN – The Global Ocean Surface-Reference Dataset for Characterization, Validation and Evaluation of the Water Cycle

Klepp

Kucera

Burdanowitz

et al. 2020

Advances in Global Change Research

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Ocean Rainfall And Ice-phase precipitation measurement Network - OceanRAIN-M

Cited by 5 publications

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The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 2. The Relationships Between Radar Observables and Drop Size Distribution Parameters

The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 2. The Relationships Between Radar Observables and Drop Size Distribution Parameters

The Latitudinal Variability of Oceanic Rainfall Properties and Its Implication for Satellite Retrievals: 1. Drop Size Distribution Properties

OceanRAIN – The Global Ocean Surface-Reference Dataset for Characterization, Validation and Evaluation of the Water Cycle

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