ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unknown

Ground validation of oceanic snowfall detection in satellite climatologies during LOFZY (2010)

Klepp, C. ; Bumke, Karl ; Bakan, S. ; [et al.]

Taylor & Francis

In: Tellus A: Dynamic meteorology and oceanography, 62 (4). pp. 469-480.

add to mindlist on the mindlist

Details

Publication Date: 2016-06-15

Description: A thorough knowledge of global ocean precipitation is an indispensable prerequisite for the understanding of the water cycle in the global climate system. However, reliable detection of precipitation over the global oceans, especially of solid precipitation, remains a challenging task. This is true for both, passive microwave remote sensing and reanalysis based model estimates. The optical disdrometer ODM 470 is a ground validation instrument capable of measuring rain and snowfall on ships even under high wind speeds. It was used for the first time over the Nordic Seas during the LOFZY 2005 campaign. A dichotomous verification of precipitation occurrence resulted in a perfect correspondence between the disdrometer, a precipitation detector and a shipboard observer's log. The disdrometer data is further point-to-area collocated against precipitation from the satellite based Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data (HOAPS) climatology. HOAPS precipitation turns out to be overall consistent with the disdrometer data resulting in a detection accuracy of 0.96. The collocated data comprises light precipitation events below 1 mm h–1. Therefore two LOFZY case studies with high precipitation rates are presented that indicate plausible HOAPS satellite precipitation rates. Overall, this encourages longer term measurements of ship-to-satellite collocated precipitation in the near future.

Type: Article , PeerReviewed

Format: text

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OCEANREP)

S·F·X

PDF

Fulltext

2

Unknown

Synoptic-Scale Behavior of the Extratropical Tropopause Inversion Layer (2015)

Pilch Kedzierski, Robin ; Matthes, Katja ; Bumke, Karl

AGU (American Geophysical Union) | Wiley

In: Geophysical Research Letters, 42 (22). 10,018-10,026.

add to mindlist on the mindlist

Details

Publication Date: 2020-11-04

Description: Key Points: Daily snapshots of TIL strength; synoptic-Scale behavior of the TIL and shear/curl contributions to relative vorticity; TIL within ridges in midlatitude winter is stronger than polar summer TIL High-resolution GPS radio occultation temperature profiles from the COSMIC satellite mission (2007–2013) are used to obtain daily snapshots of the strength of the extratropical tropopause inversion layer (TIL). Its horizontal structure and day-to-day variability are linked to the synoptic situation at near-tropopause level. The strength of the TIL in cyclonic as well as anticyclonic conditions is investigated by separating relative vorticity into curl and shear terms. The analysis shows that the TIL has high zonal variability, and its strength is instantaneously adjusted to the synoptic situation at near-tropopause level. Our key finding is that the TIL within midlatitude ridges in winter is as strong as or stronger than the TIL in polar summer. The strongest TIL in anticyclonic conditions is related to the shear term, while the weaker TIL in cyclonic conditions is enhanced by the curl term.

Type: Article , PeerReviewed

Format: text

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OCEANREP)

S·F·X

PDF

Fulltext

3

Unknown

HOAPS precipitation validation with ship-borne rain gauge measurements over the Baltic Sea (2012)

Bumke, Karl ; Fennig, Karsten ; Strehz, Alexander ; [et al.]

Taylor & Francis

In: Tellus A: Dynamic meteorology and oceanography, 64 (18486).

add to mindlist on the mindlist

Details

Publication Date: 2016-06-14

Description: Global ocean precipitation is an important part of the water cycle in the climate system. A number of efforts have been undertaken to acquire reliable estimates of precipitation over the oceans based on remote sensing and reanalysis modelling. However, validation of these data is still a challenging task, mainly due to a lack of suitable in situ measurements of precipitation over the oceans. In this study, validation of the satellite-based Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data (HOAPS) climatology was conducted with in situ measurements by ship rain gauges over the Baltic Sea from 1995 to 1997. The ship rain gauge data are point-to-area collocated against the HOAPS data. By choosing suitable collocation parameters, a detection rate of up to about 70% is achieved. Investigation of the influence of the synoptic situation on the detectability shows that HOAPS performs better for stratiform than for convective precipitation. The number of collocated data is not sufficient to validate precipitation rates. Thus, precipitation rates were analysed by applying an interpolation scheme based on the Kriging method to both data sets. It was found that HOAPS underestimates precipitation by about 10%, taking into account that precipitation rates below 0.3 mm h−1 cannot be detected from satellite information.

Type: Article , PeerReviewed

Format: text

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OCEANREP)

S·F·X

PDF

Fulltext

4

Unknown

Mixed layer heat and salinity budgets during the onset of the 2011 Atlantic cold tongue (2014)

Schlundt, Michael ; Brandt, Peter ; Dengler, Marcus ; [et al.]

AGU (American Geophysical Union) | Wiley

In: Journal of Geophysical Research: Oceans, 119 . pp. 7882-7910.

add to mindlist on the mindlist

Details

Publication Date: 2021-05-19

Description: The mixed layer (ML) temperature and salinity changes in the central tropical Atlantic have been studied by a dedicated experiment (Cold Tongue Experiment (CTE)) carried out from May to July 2011. The CTE was based on two successive research cruises, a glider swarm, and moored observations. The acquired in situ data sets together with satellite, reanalysis, and assimilation model data were used to evaluate box-averaged ML heat and salinity budgets for two subregions: (1) the western equatorial Atlantic cold tongue (ACT) (23°–10°W) and (2) the region north of the ACT. The strong ML heat loss in the ACT region during the CTE was found to be the result of the balance of warming due to net surface heat flux and cooling due to zonal advection and diapycnal mixing. The northern region was characterized by weak cooling and the dominant balance of net surface heat flux and zonal advection. A strong salinity increase occurred at the equator, 10°W, just before the CTE. During the CTE, ML salinity in the ACT region slightly increased. Largest contributions to the ML salinity budget were zonal advection and the net surface freshwater flux. While essential for the ML heat budget in the ACT region, diapycnal mixing played only a minor role for the ML salinity budget. In the region north of the ACT, the ML freshened at the beginning of the CTE due to precipitation, followed by a weak salinity increase. Zonal advection changed sign contributing to ML freshening at the beginning of the CTE and salinity increase afterward.

Type: Article , PeerReviewed , info:eu-repo/semantics/article

Format: text

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER (OCEANREP)

S·F·X

PDF

Fulltext

5

Unknown

Precipitation over sea: Validation against shipboard in-situ measurements (2016)

Bumke, Karl ; König-Langlo, Gert ; Kinzel, Julian ; [et al.]

PANGAEA

In: Supplement to: Bumke, Karl; König-Langlo, Gert; Kinzel, Julian; Schröder, Marc (2016): HOAPS and ERA-Interim precipitation over the sea: validation against shipboard in situ measurements. Atmospheric Measurement Techniques, 9(5), 2409-2423, https://doi.org/10.5194/amt-9-2409-2016

add to mindlist on the mindlist

Details

Publication Date: 2023-01-13

Description: The satellite derived HOAPS (Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite data) and ECMWF (European Centre for Medium-Range Weather Forecasts) ERA-Interim reanalysis data sets have been validated against in-situ precipitation measurements from ship rain gauges and optical disdrometers over the open-ocean by applying a statistical analysis for binary forecasts. For this purpose collocated pairs of data were merged within a certain temporal and spatial threshold into single events, according to the satellites' overpass, the observation and the forecast times. HOAPS detects the frequency of precipitation well, while ERA-Interim strongly overestimates it, especially in the tropics and subtropics. Although precipitation rates are difficult to compare because along-track point measurements are collocated with areal estimates and the numbers of available data are limited, we find that HOAPS underestimates precipitation rates, while ERA-Interim's Atlantic-wide average precipitation rate is close to measurements. However, regionally averaged over latitudinal belts, there are deviations between the observed mean precipitation rates and ERA-Interim. The most obvious ERA-Interim feature is an overestimation of precipitation in the area of the intertropical convergence zone and the southern sub-tropics over the Atlantic Ocean. For a limited number of snow measurements by optical disdrometers it can be concluded that both HOAPS and ERA-Interim are suitable to detect the occurrence of solid precipitation.

Type: Dataset

Format: application/zip, 3 datasets

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

DATA PANGAEA

S·F·X

Fulltext

6

Unknown

Precipitation measurements over the Baltic Sea from 1995 until 2004 using ship rain gauges (2016)

Bumke, Karl

PANGAEA

In: Supplement to: Bumke, Karl (2016): Validation of ERA-Interim Precipitation Estimates over the Baltic Sea. 7(6), 82, https://doi.org/10.3390/atmos7060082

add to mindlist on the mindlist

Details

Publication Date: 2023-01-13

Description: Rain rates measured onboard ships, merchant ships and research vessels, by ship rain gauges. Data are gained over the Baltic Sea area, measurement intervals are 8 min.

Keywords: DATE/TIME; LATITUDE; LONGITUDE; Precipitation; Rain gauge

Type: Dataset

Format: text/tab-separated-values, 2014210 data points

Permalink