Use and Feedback on GlobWave Data and Services Perspective of basic studies

Transcription

1 Use and Feedback on GlobWave Data and Services Perspective of basic studies Sergei I. Badulin P.P. Shirshov Institute of Oceanology of Russian Academy of Science

2 bookmark us

3 P.P.SHIRSHOV INSTITUTE OF OCEANOLOGY Sea Atmosphere Interaction And Climate Laboratory

4 Part I. STUDIES OF WIND-WAVE CLIMATE

5 Global Atlas of Ocean Waves based on VOS observations based on the Voluntary Observing Ship (VOS) data from the ICOADS swh Jan separate estimates of sea, swell and significant wave height (SWH) over the Global Ocean (updated) monthly 2-degree resolution swh Jul all maps are accompanied by original and analyzed data V. Grigorieva and S. Gulev IO RAS 07 May 2010 Project GlobWave No. 5

6 VOS - Altimetry comparison For the validation of the climatology we used Ku-band altimeter data from GEOSAT, TOPEX / POSEIDON and ERS-1 / 2 VOS ALT Spatial and temporal resolution as VOS VOS - ALT , except for some months with missing data in The magnitude of differences ranges from -1 to 1 meter for almost all regions 07 May 2010 Project GlobWave No. 6

7 VOS - Altimetry comparison VOS ALT overestimation small waves in the tropics and subtropics VOS - ALT underestimation high waves in mid latitudes of both Hemispheres Sampling uncertainty is a minor contributor to this bias which is largely influenced by fundamental biases in algorithms of the altimeter retrievals 07 May 2010 Project GlobWave No. 7

8 Our needs for global climate studies High resolution satellite wave data are required for further validation of the visual wave observations, including estimation of extreme wave statistics, especially in the regions with poor sampling density, e.g. in the Southern Ocean. Satellite based regional products are to be compared with extensive VOS observations in well-sampled regions. Potentially satellite products along with model wave hindcasts and VOS data can be used for the development of blended (or synthetic) global products of ocean wind waves. 07 May 2010 No. 8

9 Part II. INLAND SEAS AND GREAT LAKES

10 The Caspian Sea The Caspian Sea presents the world s largest isolated water reservoir, with only an isolation being its significant dissimilarity from the open seas. The other features of the Caspian Sea including its size, depth, chemical properties, peculiarities of the thermohaline structure and water circulation enable to classify it as a deep inland sea. The isolation of the Caspian Sea from the ocean and its inland position are responsible for a great importance of the outer thermohydrodynamic factors, specifically, the heat and water fluxes through the sea surface, and river runoff for the sea level variability, formation of its 3D thermohaline structure and water circulation.

11 Wind speed (m/s) Temporal Variability of Wind Speed in Crossover Points Number of measurements Northern Part Middle Part Time (year) Southern Part Wind speed (m/s)

12 Temporal Variability of Wave Height in Crossover Points Number of measurements Significant wave height (m) Northern Part Middle Part Time (year) Southern Part Significant wave height (m)

13 Wind Conditions Repetition of wind speed derived from satellite altimetry in the crossover points of the Northern, Middle and Southern Caspian Sea (October 1992 December 2005) с.ш в.д Regions (1) (8) correspond to hydrometeorological division of the Caspian Sea. Region Northern Part Middle Part Southern Part Crossover Points Number of Region Wind Speed Range, (m/s) Repetition of Events, % < >

14 Wave Conditions Repetition of SWH derived from satellite altimetry in the crossover points of the Northern, Middle and Southern Caspian Sea (October 1992 December 2005) с.ш в.д Regions (1) (8) correspond to hydrometeorological division of the Caspian Sea. Region Northern Part Middle Part Southern Part Crossover Points Number of Region SWH Range, (m) Repetition of Events, % <

15 Wind speed (m/s) Wind speed (m/s) Significant wave height (m) Significant wave height (m) Seasonal Variation of Wind Speed and SWH The Middle Caspian Sea The Southern Caspian Sea I II III IV V VI VII VIII IX X XI XII Time (month) I II III IV V VI VII VIII IX X XI XII Time (month) I II III IV V VI VII VIII IX X XI XII Time (month) I II III IV V VI VII VIII IX X XI XII Time (month)

16 Wind Speed Seasonal Variability April October January July

17 С.А. Лебедев А.Г. Костяной Спутниковая альтиметрия Каспийского моря С.А. Лебедев, А.Г. Костяной Спутниковая альтиметрия Каспийского моря The main results have been published in the following book in Russian edition: Lebedev S.A. and Kostianoy A.G. Satellite Altimetry of the Caspian Sea Moscow: Sea, 2005, 366 pp. 07 May 2010 Project GlobWave No. 17

18 Black Sea Location of the ENVISAT ground tracks which were used for the comparison of the altimetry wind with meteo station wind data 07 May 2010 Project GlobWave No. 18

19 Black Sea Location of the TOPEX-B and Jason-1 ground tracks which were used for the comparison of the altimetry wind with meteo station wind data 07 May 2010 Project GlobWave No. 19

20 Correlation between altimetry wind and meteo station wind data 07 May 2010 Project GlobWave No. 20

21 07 May 2010 Project GlobWave No. 21

22 Our needs for regional studies Intercalibration of regional approaches for retrieving wave data from satellite measurements (within special working groups) Intercomparison of different methods of wave measurements (SAR, altimeter, radometers, optical methods etc.) 07 May 2010 Project GlobWave No. 22

23 Questions 07 May 2010 No. 23