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Four decades of microwave satellite soil moisture observations

Karthikeyan L

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Four decades of microwave satellite soil moisture observations
« on: October 23, 2017, 12:13:28 PM »
Recently, I have published a couple of papers related to satellite microwave soil moisture research in the Advances in Water Resources Journal.

The process of retrieving soil moisture from satellite microwave sensors depends on the type of sensor i.e., active and passive microwave sensors. Over the past four decades, the microwave community has progressed in terms of improving the sensor design and retrieval algorithm so as to achieve accurate global scale soil moisture observations.

The first paper titled "Four decades of microwave satellite soil moisture observations: Part 1. A review of retrieval algorithms" gives a comprehensive overview of the developments that took place in the retrieval algorithms over the past four decades. The paper discusses the algorithmic developments of both active as well as passive sensors. We have also, for the first time, summarized the literature in the form of figures, one each for active and passive microwave soil moisture research (PFA). This review also discusses the latest developments in components of the algorithms, and also discusses the challenges that need attention in future. I can say that this paper serves as a starting point for someone who wants to venture into the field of microwave soil moisture research.

The second paper titled "Four decades of microwave satellite soil moisture observations: Part 2. Product validation and inter-satellite comparisons" is focused on assessing the accuracy of soil moisture products, which were developed over the past forty years. We have considered eight passive (SMMR, SSM/I, TMI, AMSR-E, WindSAT, AMSR2, SMOS, and SMAP), two active (ERS-Scatterometer, and MetOp-ASCAT), and one active-passive combined (ESA-CCI combined product) soil moisture products for the analysis. The Contiguous United States (CONUS) is considered as a case study. The validation is carried out using the data pertaining to 1058 stations over the CONUS, along with model soil moisture simulations obtained from the VIC land surface model. We analyzed these products in terms of daily coverage (a figure in this context is atteched with this post), temporal performance, and spatial performance. We also carried out inter-satellite comparisons to study the roles of sensor design and algorithms on the retrieval accuracy. The Part 1 serves as a prelude to this paper. Through these papers, one can get an idea about how well the satellites along with algorithms have progressed over the four decades and significantly improved the accuracy of soil moisture retrievals.

Part 1 can be downloaded for free from here: https://authors.elsevier.com/a/1VjkU16J1mlNrZ (until November 4, 2017)
Part 2 can be downloaded for free from here: https://authors.elsevier.com/a/1VoHy16J1mlNra (until November 17, 2017)

Here are the permanent links:
Part 1: http://www.sciencedirect.com/science/article/pii/S0309170817301859
Part 2: http://www.sciencedirect.com/science/article/pii/S0309170817301860

You can write an email to me at karthik120120@gmail.com for full-text requests or any other query related to papers.
« Last Edit: October 24, 2017, 01:52:25 PM by Karthikeyan L »
 
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Diwan

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Re: Four decades of microwave satellite soil moisture observations
« Reply #1 on: October 23, 2017, 12:34:50 PM »
Excellent work Karthikeyan..:):)
Research Scholar
Dept. of Applied Mechanics & Hydraulics
National Institute of Technology Karnataka
Surathkal Mangalore - 575025
 

Sonali

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Re: Four decades of microwave satellite soil moisture observations
« Reply #2 on: October 23, 2017, 02:43:56 PM »
Congratulations Karthik..
Thanks & Regards

Sonali Pattanayak
Research Associate
Divecha Center for Climate Change
IISc,Bangalore-12