Dataset Collection

The Aeolus return signal produced by the ALADIN instrument is the summed contribution of:

  1. scattering and absorption of the 355 nm laser beam by the atmosphere;

  2. reflection by the sea surface;

  3. scattering and absorption by sub-surface constituents in the water column.

This study focuses on the range bin including the sea surface. Hence the atmospheric contribution is limited to the effect of sea salt. Reflection by the sea surface is determined by waves and white capping created by local wind. Sub-surface signal is determined by constituents, including suspended matter, chlorophyll and dissolved organic matter.

To model and assess the magnitude of each contribution the relevant parameters will be collected.

Periods

Data from the Aeolus mission will be studied in 3 time-blocks as determined by the reprocessing process. Three reprocessing periods are foreseen.

Aeolus Data Sets

ID

Mission Period

Laser ID

Availability

1

July 2019 - December 2019

2

Project start

1+

April 2020 - present

2

Q1 2021

2

July 2019 - March 2021

2

Q1 2021

3

September 2018 - June 2019

1

Q3 2021

Aeolus carries 2 laser systems

Data will be analyzed in the same order as the reprocessing.

Areas

To obtain global information on the relevant parameters, data from other EO missions are considered the prime source as they are available globally and standardized. For the proof concept of using Aeolus to measure wind speed, we will initially focus on areas where (1) the impact of some parameters can be neglected or (2) a single parameters dominates. 1. The Anticyclonic South Pacific Gyre (SPG) is one of the most oligotrophic waters on Earth, the water is very clear and sub-surface returns are very small. 2. The Gulf of Lion is characterized by strong winds and it is expected that the impact of white capping and sea salt will dominate the Aeolus return signal.

EO data

Based on the above data requirements relevant EO missions - including Aeolus - have been listed.

EO Missions Data Sets

Mission

Instrument

Parameters

Aeolus

ALADIN

(sub)surface return

MetOp

ASCAT

sea surface wind speed and direction, sigma0

Aqua and Terra

MODIS

Ocean color, CHL, TSM, CDOM

Sentinel-3

OLCI

Ocean color, CHL, TSM, CDOM

NPP

VIIRS

Ocean color, CHL, TSM, CDOM

SYGNSS

DDMI

sea surface wind speed

Collocation

In the initial phase of the project, data of the above EO missions will be collocated in space and time. The maximum number of collocations depends in a deterministic way on the orbit parameters of each mission, e.g. repeat cycle, equator crossing time, etc. The actual number will be reduced due to e.g. cloud cover.

Access to selected datasets

Selected datasets prepared under this project, will be made available to the general public at no cost. These particular datasets will be identified here. If you want to access to a copy of this dataset please send a request to email address listed in the Contact section of the home page of this project.