scholarly journals GF-3 SAR Ocean Wind Retrieval: The First View and Preliminary Assessment

2017 ◽  
Vol 9 (7) ◽  
pp. 694 ◽  
Author(s):  
He Wang ◽  
Jingsong Yang ◽  
Alexis Mouche ◽  
Weizeng Shao ◽  
Jianhua Zhu ◽  
...  
Keyword(s):  
Preliminary Assessment ◽  
Wind Retrieval ◽  
Ocean Wind

scholarly journals Europe's offshore winds assessed with synthetic aperture radar, ASCAT and WRF

2020 ◽  
Vol 5 (1) ◽  
pp. 375-390 ◽  
Author(s):  
Charlotte B. Hasager ◽  
Andrea N. Hahmann ◽  
Tobias Ahsbahs ◽  
Ioanna Karagali ◽  
Tija Sile ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Wrf Model ◽  
Offshore Wind ◽  
Synthetic Aperture ◽  
Grid Spacing ◽  
North West ◽  
Wind Retrieval ◽  
The North ◽  
Ocean Wind ◽  
Aperture Radar

Abstract. Europe's offshore wind resource mapping is part of the New European Wind Atlas (NEWA) international consortium effort. This study presents the results of analysis of synthetic aperture radar (SAR) ocean wind maps based on Envisat and Sentinel-1 with a brief description of the wind retrieval process and Advanced Scatterometer (ASCAT) ocean wind maps. The wind statistics at 10 and 100 m above mean sea level (a.m.s.l.) height using an extrapolation procedure involving simulated long-term stability over oceans are presented for both SAR and ASCAT. Furthermore, the Weather Research and Forecasting (WRF) offshore wind atlas of NEWA is presented. This has 3 km grid spacing with data every 30 min for 30 years from 1989 to 2018, while ASCAT has 12.5 km and SAR has 2 km grid spacing. Offshore mean wind speed maps at 100 m a.m.s.l. height from ASCAT, SAR, WRF and ERA5 at a European scale are compared. A case study on offshore winds near Crete compares SAR and WRF for flow from the north, west and all directions. The paper highlights the ability of the WRF model to simulate the overall European wind climatology and the near-coastal winds constrained by the resolution of the coastal topography in the WRF model simulations.

A Novel Approach to SAR Ocean Wind Retrieval

2019 ◽  
Vol 57 (9) ◽  
pp. 6986-6995
Author(s):  
Vegard Nilsen ◽  
Geir Engen ◽  
Harald Johnsen
Keyword(s):  
Wind Retrieval ◽  
Novel Approach ◽  
Ocean Wind

scholarly journals Ocean Wind Retrieval Models for RADARSAT Constellation Mission Compact Polarimetry SAR

2018 ◽  
Vol 10 (12) ◽  
pp. 1938 ◽  
Author(s):  
Tianqi Sun ◽  
Guosheng Zhang ◽  
William Perrie ◽  
Biao Zhang ◽  
Changlong Guan ◽  
...  
Keyword(s):  
Cross Sections ◽  
Quadratic Function ◽  
Retrieval Model ◽  
Retrieval Models ◽  
Wind Retrieval ◽  
Geophysical Model ◽  
Radar Cross Sections ◽  
Geophysical Model Function ◽  
Ocean Wind

We propose two new ocean wind retrieval models for right circular-vertical (RV) and right circular-horizontal (RH) polarizations respectively from the compact-polarimetry (CP) mode of the RADARSAT Constellation Mission (RCM), which is scheduled to be launched in 2019. For compact RV-polarization (right circular transmit and vertical receive), we build the wind retrieval model (denoted CoVe-Pol model) by employing the geophysical model function (GMF) framework and a sensitivity analysis. For compact RH polarization (right circular transmit and horizontal receive), we build the wind retrieval model (denoted the CoHo-Pol model) by using a quadratic function to describe the relationship between wind speed and RH-polarized normalized radar cross-sections (NRCSs) along with radar incidence angles. The parameters of the two retrieval models are derived from a database including wind vectors measured by in situ National Data Buoy Center (NDBC) buoys and simulated RV- and RH-polarized NRCSs and incidence angles. The RV- and RH-polarized NRCSs are generated by a RCM simulator using C-band RADARSAT-2 quad-polarized synthetic aperture radar (SAR) images. Our results show that the two new RCM CP models, CoVe-Pol and CoHo-POL, can provide efficient methodologies for wind retrieval.

Assessments of Ocean Wind Retrieval Schemes Used for Chinese Gaofen-3 Synthetic Aperture Radar Co-Polarized Data

2019 ◽  
Vol 57 (9) ◽  
pp. 7075-7085 ◽  
Author(s):  
Lin Ren ◽  
Jingsong Yang ◽  
Alexis A. Mouche ◽  
He Wang ◽  
Gang Zheng ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Wind Retrieval ◽  
Ocean Wind ◽  
Aperture Radar

C-Band Right-Circular Polarization Ocean Wind Retrieval

2019 ◽  
Vol 16 (9) ◽  
pp. 1398-1401 ◽  
Author(s):  
Guosheng Zhang ◽  
Biao Zhang ◽  
William Perrie ◽  
Yijun He ◽  
Haiyan Li ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Wind Retrieval ◽  
Ocean Wind

scholarly journals Europe’s offshore winds assessed from SAR, ASCAT and WRF

2019 ◽  
Author(s):  
Charlotte B. Hasager ◽  
Andrea N. Hahmann ◽  
Tobias Ahsbahs ◽  
Ioanna Karagali ◽  
Tija Sile ◽  
...  
Keyword(s):  
Wrf Model ◽  
Offshore Wind ◽  
North West ◽  
Wind Retrieval ◽  
Long Term Stability ◽  
Mean Wind Speed ◽  
Coastal Winds ◽  
Wind Statistics ◽  
Ocean Wind ◽  
Wind Resource

Abstract. Europe’s offshore wind resource mapping is part of the New European Wind Atlas (NEWA) international consortium effort. This study presents the results of analysis of Synthetic Aperture Radar (SAR) ocean wind maps based on Envisat and Sentinel-1 with a brief description of the wind retrieval process and Advanced SCATterometer (ASCAT) ocean wind maps. The wind statistics at 10m and 100m height using an extrapolation procedure involving simulated long-term stability over oceans is presented for both SAR and ASCAT. Furthermore, the Weather Research and Forecasting (WRF) offshore wind atlas of NEWA is presented. This has 3 km grid resolution with data every 30 minutes during 30 years from 1989 to 2018, while ASCAT has 12.5 km and SAR has 2 km resolution. Offshore mean wind speed maps at 100 m height from ASCAT, SAR, WRF and ERA5 at a European scale are compared. A case study on offshore winds near Crete compares SAR and WRF for flow from north, west and all directions. The paper highlights the ability of the WRF model to simulate the overall European wind climatology and the near coastal winds constrained by the resolution of the coastal topography in the WRF model simulations.

Procedure for Maximizing Phonological Information from Single-Word Responses

1984 ◽  
Vol 15 (4) ◽  
pp. 267-274 ◽  
Author(s):  
Harriet B. Klein
Keyword(s):  
Phonological Information ◽  
Single Word ◽  
Preliminary Assessment ◽  
Target Attainment ◽  
Phonological Processes ◽  
Step Procedure ◽  
Yield Information ◽  
Assessment Measure ◽  
Busy Clinician ◽  
Planning Intervention

Formal articulation test responses are often used by the busy clinician as a basis for planning intervention goals. This article describes a 6-step procedure for using efficiently the single-word responses elicited with an articulation test. This procedure involves the assessment of all consonants within a word rather than only test-target consonants. Responses are organized within a Model and Replica chart to yield information about an individual's (a) articulation ability, (b) frequency of target attainment, substitutions, and deletions, (c) variability in production, and (d) phonological processes. This procedure is recommended as a preliminary assessment measure. It is advised that more detailed analysis of continuous speech be undertaken in conjunction with early treatment sessions.

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