Impact of satellite-based lake surface observations on the initial state
                        of HIRLAM. Part I: evaluation of remotely-sensed lake surface water
                        temperature observations

Pour, Homa Kheyrollah; Duguay, Claude R.; Solberg, Rune; Rudjord, Oystein

doi:10.3402/tellusa.v66.21534

Cited by 13 publications

(16 citation statements)

References 17 publications

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“…A possible scenario consequent to a reduced ice cover involves abundance of periphytic diatoms in shallow lakes (Smol et al, 2005), diversification of the planktonic flora (Keatley et al, 2008), and an overall increase of the primary production rate (Smol et al, 2005). Lakes within the polar deserts may virtually start to respond and act like those within polar oases consequent to the changing climate conditions (Young and Abnizova, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Evidence of recent changes in the ice regime of lakes in the Canadian High Arctic from spaceborne satellite observations

2016

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Abstract. Arctic lakes, through their ice cover phenology, are a key indicator of climatic changes that the high-latitude environment is experiencing. In the case of lakes in the Canadian Arctic Archipelago (CAA), many of which are ice covered more than 10 months per year, warmer temperatures could result in ice regime shifts. Within the dominant polardesert environment, small local warmer areas have been identified. These relatively small regions -polar oases -with longer growing seasons and greater biological productivity and diversity are secluded from the surrounding barren polar desert. The ice regimes of 11 lakes located in both polardesert and polar-oasis environments, with surface areas between 4 and 542 km 2 , many of unknown bathymetry, were documented. In order to investigate the response of ice cover of lakes in the CAA to climate conditions during recent years, a 15-year time series (1997-2011) of RADARSAT-1/2 ScanSAR Wide Swath, ASAR Wide Swath, and Landsat acquisitions were analyzed. Results show that melt onset occurred earlier for all observed lakes. With the exception of Lower Murray Lake, all lakes experienced earlier summer ice minimum and water-clear-of-ice (WCI) dates, with greater changes being observed for polar-oasis lakes (9-24 days earlier WCI dates for lakes located in polar oases and 2-20 days earlier WCI dates for polar-desert lakes). Additionally, results suggest that some lakes may be transitioning from a perennial/multiyear to a seasonal ice regime, with only a few lakes maintaining a multiyear ice cover on occasional years. Aside Lake Hazen and Murray Lakes, which preserved their ice cover during the summer of 2009, no residual ice was observed on any of the other lakes from 2007 to 2011.

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Section: Discussionmentioning

confidence: 99%

“…MODIS Aqua and Terra MOD 11-L2 data, at a spatial resolution of 1 km, were used to derive the MODIS UW-L3 land surface temperature product (Kheyrollah Pour et al, 2014). In order to derive the monthly average land surface temperature (LST), daily averages were calculated first.…”

Section: Modis Surface Temperaturementioning

confidence: 99%

Evidence of recent changes in the ice regime of lakes in the Canadian High Arctic from spaceborne satellite observations

2016

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“…In this study, the MODIS UW-L3 Lake Surface Water Temperature (LSWT) product was used [35,36]. The product is generated from Aqua and Terra MYD/MOD 11-L2 data, at a spatial resolution of 1 km.…”

Section: Modis Lake/ice Surface Temperaturementioning

confidence: 99%

“…In such case, it is feasible to combine observations from both sensors in each pixel during an hour. The MODIS UW-L3 LSWT/LIST product has been evaluated against in situ temperature measurements over Finnish lakes [36,39] as well as one-dimensional lake models over two large Canadian lakes [35].…”

Section: Modis Lake/ice Surface Temperaturementioning

confidence: 99%

Ice Freeze-up and Break-up Detection of Shallow Lakes in Northern Alaska with Spaceborne SAR

et al. 2015

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Shallow lakes, with depths less than ca. 3.5-4 m, are a ubiquitous feature of the Arctic Alaskan Coastal Plain, covering up to 40% of the land surface. With such an extended areal coverage, lakes and their ice regimes represent an important component of the cryosphere. The duration of the ice season has major implications for the regional and local climate, as well as for the physical and biogeochemical processes of the lakes. With day and night observations in all weather conditions, synthetic aperture radar (SAR) sensors provide year-round acquisitions. Monitoring the evolution of radar backscatter (σ°) is useful for detecting the timing of the beginning and end of the ice season. Analysis of the temporal evolution of C-band σ° from Advanced Synthetic Aperture Radar (ASAR) Wide Swath and RADARSAT-2 ScanSAR, with a combined frequency of acquisitions from two to five days, was employed to evaluate the potential of SAR to detect the timing of key lake-ice events. SAR observations from 2005 to 2011 were compared to outputs of the Canadian Lake Ice Model (CLIMo). Model simulations fall within similar ranges with those of the SAR observations, with a mean difference between SAR observations and model simulations of only one day for water-clear-of-ice (WCI) from 2006 to 2010. For freeze onset (FO), larger mean differences were observed. SAR analysis shows that the mean FO date for these OPEN ACCESS Remote Sens. 2015, 7 6134 shallow coastal lakes is 30 September and the mean WCI date is 5 July. Results reveal that greater variability existed in the mean FO date (up to 26 days) than in that of melt onset (MO) (up to 12 days) and in that of WCI (6 days). Additionally, this study also identifies limitations and provides recommendations for future work using C-band SAR for monitoring the lake-ice phenology of shallow Arctic lakes.

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“…This data-set was developed from both Terra and Aqua satellites (Kheyrollah Pour et al, 2012, 2014a. Both day-time and night-time LSWT observations from Terra and Aqua satellites and estimated errors for each observation were retrieved.…”

Section: Satellite-based Observationsmentioning

confidence: 99%

Towards improved objective analysis of lake surface water temperature in a NWP model: preliminary assessment of statistical properties

Pour

Choulga

Eerola

et al. 2017

Tellus A: Dynamic Meteorology and Oceanography

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Information about the statistical structure of the lake surface water temperature (LSWT) field is needed for assimilation of lake observations into Numerical Weather Prediction (NWP) models, to describe the lake surface state at each gridpoint containing lakes. In this study, we obtain the autocorrelation function for LSWT from two types of observations, in situ and satellite-based. We use summer time measurements during 2010-2014 over selected Fennoscandian lakes and Northern European domain. The estimated autocorrelations decrease exponentially (from 0.99 to 0.73 for in situ and from 0.97 to 0.61 for satellite observations), when the distance between observations increases from zero to one thousand kilometres .A large difference in lake depth leads to a decrease of the correlation. Typical error standard deviation of LSWT observations was found to be 0.9 • C for in situ observations and 1.2 • C for satellite observations. The exponential approximation for the LSWT autocorrelation functions is proposed, which depends on both the distance and the difference in lake depth. These results are directly applicable for the LSWT objective analysis in NWP. New autocorrelation functions, which allow interpolation of observations within and between lakes, were used in numerical experiments with the High-Resolution Limited Area Model (HIRLAM). In this preliminary assessment, we suggest adaptation of the presently used functions by increasing the influence radius and taking into account the lake depth difference. Generalization of the results to cover the melting and freezing seasons, their assessment for different geographical areas as well as their application to other prognostic lake variables within NWP are foreseen.

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Impact of satellite-based lake surface observations on the initial state of HIRLAM. Part I: evaluation of remotely-sensed lake surface water temperature observations

Cited by 13 publications

References 17 publications

Evidence of recent changes in the ice regime of lakes in the Canadian High Arctic from spaceborne satellite observations

Evidence of recent changes in the ice regime of lakes in the Canadian High Arctic from spaceborne satellite observations

Ice Freeze-up and Break-up Detection of Shallow Lakes in Northern Alaska with Spaceborne SAR

Towards improved objective analysis of lake surface water temperature in a NWP model: preliminary assessment of statistical properties

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