ADEOS-II/AMSR L2 Sea Surface Wind

  • DOI: 10.57746/EO.01gs73aqetpmpg81ndgb41rb1s
  • Last Updated: 2023-02-14
Data Progress: Complete
G-Portal

Product Summary

ADEOS-II/AMSR L2 Sea Surface Wind dataset is obtained from the AMSR sensor onboard ADEOS-II and produced by the Japan Aerospace Exploration Agency (JAXA).
The Advanced Earth Observing Satellite-II (ADEOS-II) was launched on December 14, 2002 (Japanese Standard Time). The objective of ADEOS-II was to acquire data to contribute to international global climate change research, as well as for applications such as meteorology and fishery. ADEOS-II operation on orbit was given up on October 31 2003, because sufficient electric power was not available to maintain operation of the satellite.
AMSR observes various physical contents concerning to water (H2O) by receiving weak microwaves naturally radiated from the Earth's surface and atmosphere and also regardless of day or night, the presence of clouds. Those sensors aim at collecting global data for mainly understanding the circulation of water and energy.
Level 2 product stores the Geophysical quantity from the brightness temperature of level 1 product.
This product includes Sea Surface Wind (SSW). SSW is retrieved mainly from 36.5 GHz vertical (V) and horizontal (H) brightness temperature of AMSR by a graphical method. The retrieval is restricted to no rain condition since the brightness temperature of 36.5 GHz is saturated under rainy condition, SSW obtained only from 36.5 GHz has a large anisotropic feature depending on an angle between antenna direction and wind direction. Its anisotropic feature is corrected by using two data from 36.5 and 10.65 GHz, since 10.65 GHz data are less anisotropic. Even under rainy condition, 10.65 and 6.925 GHZ data are not saturated, so wind speed is retrieved by using those H data. Retrieval accuracy of wind speed using 10.65 and 6.925 GHz becomes worse than using 36.5 GHz, since a sensitivity of 10.65 and 6.925 GHz to wind speed is not so strong. 36.5 GHz data is used for the algorithm of standard products processing. 6.925 GHz and 10.65 GHz data are used for research product, which is provided from EORC. The physical quantity unit is m/s.
The provided format is HDF4. Spatial resolution is 10 km. The current version of the product is "Version 7". The generation unit is scene (defined as a half orbit).

Platform
ADEOS-II
Sensor
AMSR

Coverage

Temporal Coverage

2003-04-02 to 2003-10-25

Spatial Coverage

Bounding Rectangle
(90.0°, -180.0°, -90.0°, 180.0°)

Resolution

10 km

Location

  • GEOGRAPHIC REGION > GLOBAL OCEAN
Dataset Short Name
ADEOS-II_AMSR_L2_SSW
Platform / Sensor
ADEOS-II / AMSR
Coverage
Spatial Coverage
Bounding Rectangle
(90.0°, -180.0°, -90.0°, 180.0°)
Temporal Coverage
2003-04-02 to 2003-10-25
Product Level ID
L2
Version Description

Version 1, 2003-12-24, Notavailable
Version 3, 2005-03-01, Notavailable
Version 4, 2006-03-15, Notavailable
Version 5, 2007-03-12, Notavailable
Version 7, 2011-09-28, Available

File Format
HDF4
Dataset Type
None / Scene
Resolution
Spatial Resolution
10 km
Temporal Resolution
None
Dataset Progress
Complete
Projection
None
Collection Data Type
SCIENCE_QUALITY
Get Data
https://gportal.jaxa.jp/gpr/?lang=en
Dataset Title
ADEOS-II/AMSR L2 Sea Surface Wind
Distribution Format
HDF4
Fees
Free
Citation
Japan Aerospace Exploration Agency. 2003. ADEOS-II/AMSR L2 Sea Surface Wind. https://doi.org/10.57746/EO.01gs73aqetpmpg81ndgb41rb1s
Access Constraints

No constraints but users need to be registered with the G-portal User Registration system to download files.

Use Constraints

The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click here for detailed G-Portal data usage constrains.

G-Portal Terms of service
https://gportal.jaxa.jp/gpr/index/eula?lang=en
ISO Topic Categories
  • OCEANS
Science Keywords
  • EARTH SCIENCE > OCEANS > OCEAN WINDS > SURFACE WINDS
Location Keywords
  • GEOGRAPHIC REGION > GLOBAL OCEAN

ISO Topic Categories is the keywords in the ISO 19115 - Geographic Information Metadata.

Science Keywords hosts Global Change Master Directory (GCMD) Keywords which are a hierarchical set of controlled Earth Science vocabularies that help ensure Earth science data, services, and variables are described in a consistent and comprehensive manner and allow for the precise searching of metadata and subsequent retrieval of data, services, and variables.