Sea surface salinity estimates from space: A decade... A very interesting review has just been published on sea surface salinity from Space. Figure 1: Monthly average map of the ocean surface salinity for the month of July 2015 generated by the ESA Climate Change Initiative project. The 10 years-long CCI-SSS time series is obtained by merging the salinity data from the SMOS, Aquarius, and SMAP. Operated since the...

Readmore

A very stormy February 2020 in the North Atlantic From Nicolas Reul Ifremer (see) During the first two weeks of February 2020, and more generally, since the beginning of the meteorological winter, the large scale atmospheric context in the North Atlantic and Europe, but also over the whole Northern Hemisphere is characterized by intense low-pressure circulation from the west and south-west , associated with high...

Readmore

10 years of sea surface Salinity in the Arctic from... From A. Supply These results will be presented at the "Ocean Science meeting" in Session PL24A - Ocean Salinity in Support of Scientific and Environmental Demands. Using 10 years worth of SMOS data, the authors have shown that they could monitor a number of events around the Arctic including the variability of the Beaufort Gyre during ice free periods, the...

Readmore

PhD and postdoctoral researchers – Land surface modeling,... Positions at KU Lewen! Job Description Join our team to help us take care of our Earth, by making the best use of land surface modeling, remote sensing and data assimilation. We are seeking enthusiastic candidates for 3 PhD and postdoctoral research positions. We offer a unique possibility to new researchers to choose a topic of interest within one of three...

Readmore

New global and continuous soil freeze-thaw data released... ESA SMOS product family expands with a hemispheric cryosphere product, the SMOS Level 3 freeze and thaw soil state. This new product, provided by Finnish Meteorological Institute (FMI), gives daily information on soil frost; one of the key parameters in understanding global carbon and water cycle processes. Approximately half of the Earth's land surface is affected...

Readmore

Prev

Next

Sea surface salinity estimates from space: A decade of observation (2010–2019)

Category : CATDS, L2, L3, L4, Ocean

A very interesting review has just been published on sea surface salinity from Space.

SSS low res

Figure 1: Monthly average map of the ocean surface salinity for the month of July 2015 generated by the ESA Climate Change Initiative project. The 10 years-long CCI-SSS time series is obtained by merging the salinity data from the SMOS, Aquarius, and SMAP.

Operated since the end of 2009, the European Space Agency (ESA) Soil Moisture and Ocean Salinity (SMOS) satellite mission is the first orbiting radiometer that collects regular and global observations from space of two Essential Climate Variables of the Global Climate Observing System: Sea Surface Salinity (SSS) and Soil Moisture. The National Aeronautics and Space Administration (NASA) Aquarius mission, with the primary objective to provide global SSS measurements from space operated from mid-2011 to mid-2015. NASA’s Soil Moisture Active-Passive (SMAP) mission, primarily dedicated to soil moisture measurements, but also monitoring SSS, has been operating since early 2015. The primary sensors onboard these three missions are passive microwave radiometers operating at 1.4 GHz (L-band). SSS is retrieved from radiometer measurements of the sea surface brightness temperature (TB). In a review paper published in Remote Sensing of Environment (https://www.sciencedirect.com/science/article/pii/S0034425720301395#f0005), we first provide a historical review of SSS remote sensing with passive L-band radiometry beginning with the discussions of measurement principles, technology, sensing characteristics and complementarities of the three aforementioned missions. The assessment of satellite SSS products is then presented in terms of individual mission characteristics, common algorithms, and measurement uncertainties, including the validation versus in situ data, and, the consideration of sampling differences between satellite SSS and in situ salinity measurements. We next review the major scientific achievements of the combined first 10 years of satellite SSS data, including the insights enabled by these measurements regarding the linkages of SSS with the global water cycle, climate variability, and ocean biochemistry. We also highlight the new ability provided by satellites to monitor mesoscale and synoptic-scale SSS features and to advance our understanding of SSS’ role in air-sea interactions, constraining ocean models, and improving seasonal predictions. An overview of satellite SSS observation highlights during this first decade and upcoming challenges are then presented.

satellites

Figure 2 Sea surface salinity satellites

A very stormy February 2020 in the North Atlantic

Category : Ocean

From Nicolas Reul Ifremer (see)

During the first two weeks of February 2020, and more generally, since the beginning of the meteorological winter, the large scale atmospheric context in the North Atlantic and Europe, but also over the whole Northern Hemisphere is characterized by intense low-pressure circulation from the west and south-west , associated with high wind and rain.

This configuration is related to the permanent presence of intense lows in the North Atlantic and  polar regions, contrastating with, high pressures above normal in between Açores and southern Europe. This high./low pressure dipole  generate very positive NAO  (North Atlantic Oscillation) and AO (Arctic Osvillation)  indexes as illustrated  in the map below:

NAO

On the 10th of February, the AO index indeed reach a record level since 1950 , according to NOAA  (the pressure difference between low polar and high subtropical pressure is 6 time higher than the climate mean) . In  practice this translate into very intense lows in the North Atlantic and westerly winds on the mid latitudes of the Northern hemisphere, including Europe.

Since the 8 February teh 8th,  the North Atlantic has been the subject of an impressive storm activity including Storms Ciara (9-11 Feb), Ines (12-13) and Dennis (14-16 Feb). The wind structure of these successive storms have been jointly observed by SMOS and SMAP:20200208 -08-17-08-feb-202020200208 -08-43-08-Feb-202020200208 -19-23-08-Feb-2020colorbar.png20200208 -20-50-08-feb-202020200209 -07-19-09-feb-202020200209 -08-42-09-Feb-202020200209 -19-14-09-Feb-202020200209 -20-39-09-Feb-202020200210 -07-34-10-Feb-202020200210 -08-34-10-Feb-202020200210 -19-20-10-Feb-202020200210 -20-44-10-Feb-202020200211 -07-17-11-Feb-202020200211 -08-46-11-Feb-202020200211 -19-21-11-Feb-202020200212 -19-12-12-Feb-202020200212 -20-42-12-Feb-202020200213 -07-20-13-Feb-202020200213 -08-37-13-Feb-202020200213 -19-24-13-Feb-202020200213 -20-59-13-Feb-202020200214 -07-18-14-Feb-202020200214 -08-44-14-Feb-202020200214 -19-18-14-Feb-202020200214 -20-41-14-Feb-202020200215 -07-22-15-Feb-202020200215 -08-36-15-Feb-202020200215 -19-14-15-Feb-202020200215 -20-48-15-Feb-202020200216 -07-17-16-Feb-202020200216 -08-43-16-Feb-2020

The images were acquired between February 8th and 16th with, suually, 4 acquisitions per day ( 2 SMOS and 2 SMAP). Dates and time are obtained while hovering with the cursor on them. Smos is ascending in the morning and SMAP in the evening.

10 years of sea surface Salinity in the Arctic from SMOS!

Category : CATDS, Ocean

From A. Supply

These results will be presented at the « Ocean Science meeting » in Session PL24A – Ocean Salinity in Support of Scientific and Environmental Demands.

Using 10 years worth of SMOS data, the authors have shown that they could monitor a number of events around the Arctic including the variability of the Beaufort Gyre during ice free periods, the river runoff in the Laptev Sea and Lena river plume, or in the Kara Sea and Ob’+Yenisei river plumes.

supply-poster-2020

These results are very new and outstanding.

They also show the importance of long term monitoring with L-Band radiometry (hence a SMAP / SMOS follow on mission) as well as the crucial role of a fine spatial resolution (ideally better than SMOS/SMAP) to be able to track the gyres and plumes or the variability of Pacific Waters entry in the Arctic Ocean: a large difference of salinity is recorded in the Chukchi and East-Siberian sea between 2012 and 2015 for instance.

PhD and postdoctoral researchers – Land surface modeling, remote sensing and data assimilation: KU Leuven (Belgium)

Category : position opening

Positions at KU Lewen!

Job Description

Join our team to help us take care of our Earth, by making the best use of land surface modeling, remote sensing and data assimilation. We are seeking enthusiastic candidates for 3 PhD and postdoctoral research positions.

We offer a unique possibility to new researchers to choose a topic of interest within one of three projects. Details of each project are provided via the associated links below and candidates are asked to specify their main interest upon application:

1.     Monitoring and predicting fires over peatlands, using improved land surface modeling and satellite data assimilation. (PhD)

PEATBURN, https://ees.kuleuven.be/projects/index.html?db=EES&project_id=841

2.     Improving agricultural biomass estimation, via crop modeling and satellite-based data assimilation. (Postdoc or PhD)

SHUI, https://ees.kuleuven.be/projects/index.html?project_id=604

3.     Developing a global consistent record of soil moisture and vegetation via microwave-based satellite data assimilation for climate applications. (PhD or postdoc)

CONSOLIDATION, https://ees.kuleuven.be/projects/index.html?db=EES&project_id=846

PhD positions are fully funded for 4 years, whereas postdoctoral positions are funded for 2 years.

You will fit our team if you are an experienced researcher with a keen interest in remote sensing and land surface processes and eager to work in an international setting. You will be part of the Department of Earth and Environmental Sciences at the KU Leuven under the supervision of prof. dr. ir. Gabrielle De Lannoy, dr. Michel Bechtold, dr. Alexander Gruber, and collaborators in multiple highly ranked research institutes.

Our division: http://ees.kuleuven.be/bwb/index.html

Responsibilities

- Land surface modeling, remote sensing data analysis, statistical analysis, data assimilation, in situ data analysis over large domains

- Disseminating results via peer-review publications and attendance of international conferences

- Collaborating with other postdoctoral researchers and PhD students, and international partners

- Contributions to academic teaching

Required Skills

Only applicants with all of the following skills will be considered.

For PhD students:

- Msc in Bio-Science Engineering, Civil or Environmental Engineering, Meteorology, Hydrology, Remotely Sensed Earth Observation, Physics, Mathematics, Geography or equivalent

- Msc students who will graduate beginning of July 2020 can apply

- Good experience with data-processing applications such as Matlab/Python, IDL, GrADS, R, or other.

- Interest in programming and scientific computing on Linux systems

- Interest in land surface remote sensing, hydrological or land surface modeling

- Interest in data assimilation

- Excellent motivation and grades

- Creative, critical, analytical and innovative mindset

- Ability to work independently

- Excellent written and oral communication skills in English

For postdoctoral researchers:

- PhD degree in in Bio-Science Engineering, Civil or Environmental Engineering, Meteorology, Hydrology, Remotely Sensed Earth Observation, Physics, Mathematics, Geography or equivalent

- Proven research experience in scientific publications

- Strong experience with data-processing applications such as Matlab/Python, IDL, GrADS, R, or other.

- Experience with programming and scientific computing on Linux systems

- Experience with land surface remote sensing, hydrological or land surface modeling

- Interest in data assimilation

- Excellent motivation

- Creative, critical, analytical and innovative mindset

- Ability to work independently

- Excellent written and oral communication skills in English

- Willingness to work with PhD students and help with educational tasks

We Offer

- Fully funded position for 4 (PhD) or 2 (postdoc) years, conditional on good performance

- Multi-disciplinary and international professional environment

- Leuven, a charming historical university town, with a central location in Western Europe

More information about working conditions, salary and benefits can be found here:

https://www.kuleuven.be/personeel/jobsite/en/phd/phd-information

More Information

Only persons strictly matching the above profile should apply. Please submit your resume, along with a motivation letter with an indication of your main research interest, and two names for references on-line. PhD students are also requested to submit their grades. Msc students who are graduating this year, are welcome to apply and can provide grades of the past year. (https://www.kuleuven.be/personeel/jobsite/jobs/55540142)

The starting date can be immediate after selection, or can be negotiated. For more information, please contact prof. dr. ir. Gabrielle De Lannoy, tel.: +32 16 37 67 13, e-mail: gabrielle[dot]delannoy[at]kuleuven[dot]be. With specific questions for PEATBURN, please contact dr. Michel Bechtold, tel. +32 16 32 01 67, e-mail michel[dot]bechtold[at]kuleuven[dot]be.

The selection process will start on March 15th, 2020. The position will remain open until a suitable candidate is identified.

download wordpress themes