Masashi Niwano
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View article: Snow parameter retrieval (SPR) algorithm for the GCOM-C/SGLI sensor: validation over the Greenland ice sheet
Snow parameter retrieval (SPR) algorithm for the GCOM-C/SGLI sensor: validation over the Greenland ice sheet Open
This paper presents a new snow parameter retrieval (SPR) algorithm for the Global Change Observation Mission-Climate/Second Generation Global Imager (GCOM-C/SGLI) instrument (2018-present). This algorithm combines accurate radiative transf…
View article: Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland
Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland Open
In situ meteorological data are essential for a better understanding of the ongoing environmental changes in the Arctic. In order to increase the scientific value of discussions on understanding the actual state of environmental change in …
View article: Precipitation Uncertainty Hampers the Understanding of Glacier Response in High Mountain Asia
Precipitation Uncertainty Hampers the Understanding of Glacier Response in High Mountain Asia Open
High Mountain Asia (HMA) provides crucial water resources to more than 1.5 billion people and accurate quantification of high elevation precipitation in this region is essential for understanding the hydrological cycle, patterns of ongoing…
View article: Characteristics of surface melt potential over Antarctic ice shelves based on regional atmospheric model simulations of summer air temperature extremes from 1979/80 to 2018/19
Characteristics of surface melt potential over Antarctic ice shelves based on regional atmospheric model simulations of summer air temperature extremes from 1979/80 to 2018/19 Open
We calculate a regional surface “melt potential” index (MPI) over Antarctic ice shelves that describes the frequency (MPI-freq, %) and intensity (MPI-int, K) of daily maximum summer temperatures exceeding a melt threshold of 27…
View article: Development of a handheld integrating sphere snow grain sizer (HISSGraS)
Development of a handheld integrating sphere snow grain sizer (HISSGraS) Open
We developed a Handheld Integrating Sphere Snow Grain Sizer (HISSGraS) for field use to measure the specific surface area (SSA) of snow. In addition to snow samples, HISSGraS can directly measure snow surfaces and snow pit walls. The basic…
View article: Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland, 2012–2020
Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland, 2012–2020 Open
In situ meteorological data are essential to better understand ongoing environmental changes in the Arctic. Here, we present a dataset of quality-controlled meteorological observations from two automatic weather stations in northwest Green…
View article: Modelling the development and decay of cryoconite holes in northwestern Greenland
Modelling the development and decay of cryoconite holes in northwestern Greenland Open
Cryoconite holes (CHs) are water-filled cylindrical holes with cryoconite (dark-coloured sediment) deposited at their bottoms, forming on ablating ice surfaces of glaciers and ice sheets worldwide. Because the collapse of CHs may disperse …
View article: Codes and data set for Cryoconite hole model (CryHo)
Codes and data set for Cryoconite hole model (CryHo) Open
Codes and data set for cryoconite hole model (CryHo) (Onuma et al., 2023, The Cryosphere). The content is as below. - cryho_disclose_v1: readme, the model codes, parameter files for the model, model outputs and shell scripts for sensitivit…
View article: Codes and data set for Cryoconite hole model (CryHo)
Codes and data set for Cryoconite hole model (CryHo) Open
Codes and data set for cryoconite hole model (CryHo) (Onuma et al., 2023, The Cryosphere). The content is as below. - cryho_disclose_v1: readme, the model codes, parameter files for the model, model outputs and shell scripts for sensitivit…
View article: Greenland ice sheet rainfall climatology, extremes and atmospheric river rapids
Greenland ice sheet rainfall climatology, extremes and atmospheric river rapids Open
Greenland rainfall has come into focus as a climate change indicator and from a variety of emerging cryospheric impacts. This study first evaluates rainfall in five state‐of‐the‐art numerical prediction systems (NPSs) (CARRA, ERA5, NHM‐SMA…
View article: Comment on essd-2023-116
Comment on essd-2023-116 Open
Abstract. In situ meteorological data are essential to better understand ongoing environmental changes in the Arctic. Here, we present a dataset of quality-controlled meteorological observations by two automatic weather stations in northwe…
View article: Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland, 2012–2020
Quality-controlled meteorological datasets from SIGMA automatic weather stations in northwest Greenland, 2012–2020 Open
In situ meteorological data are essential to better understand ongoing environmental changes in the Arctic. Here, we present a dataset of quality-controlled meteorological observations by two automatic weather stations in northwest Greenla…
View article: Intercomparison of quantification methods for snow microstructure during the SnowAPP experiment
Intercomparison of quantification methods for snow microstructure during the SnowAPP experiment Open
Snow microstructure defines the physical, mechanical and electromagnetic properties of snow. Accurate information of snow structure is needed by many applications, including avalanche forecasting (Hirashima et al., 2008) and numerical weat…
View article: Numerical modeling of biological processes on snow and ice surfaces on the Greenland Ice Sheet
Numerical modeling of biological processes on snow and ice surfaces on the Greenland Ice Sheet Open
Biological processes on snow and glacier surfaces in the Arctic region play a key role causing albedo reduction called as “Bio-albedo effect” due to blooms of snow and glacier phototrophs. Because the bio-albedo effect varies t…
View article: Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica
Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica Open
We reconstructed surface mass balance (SMB) around Dome Fuji, Antarctica, over the last 5000 years using the data from 15 shallow ice cores and seven snow pits. The depth–age relationships for the ice cores were determined by synchronizing…
View article: Modelling the development and decay of cryoconite holes in Northwest Greenland
Modelling the development and decay of cryoconite holes in Northwest Greenland Open
Cryoconite holes (CHs) are water-filled cylindrical holes with cryoconite (dark-coloured sediment) deposited at their bottoms, forming on ablating ice surfaces of glaciers and ice sheets worldwide. Because the collapse of CHs may disperse …
View article: Codes and data set for Cryoconite hole model (CryHo)
Codes and data set for Cryoconite hole model (CryHo) Open
Codes and data set for cryoconite hole model (CryHo) (Onuma et al., 2023). The content is as below. - cryho_disclose_v1: readme, the model codes, parameter files for the model, model outputs and shell scripts for sensitivity tests - data: …
View article: Codes and data set for Cryoconite hole model (CryHo)
Codes and data set for Cryoconite hole model (CryHo) Open
Codes and data set for cryoconite hole model (CryHo) (Onuma et al., 2023). The content is as below. - cryho_disclose_v1: readme, the model codes, parameter files for the model, model outputs and shell scripts for sensitivity tests - data: …
View article: Codes and data set for Cryoconite hole model (CryHo)
Codes and data set for Cryoconite hole model (CryHo) Open
Codes and data set for cryoconite hole model (CryHo) (Onuma et al., under review). The content is as below. - cryho_disclose: readme, the model codes, parameter files for the model, model outputs and shell scripts for sensitivity tests - d…
View article: Characteristics of Surface “Melt Potential” over Antarctic Ice Shelves based on Regional Atmospheric Model Simulations of Summer Air Temperature Extremes from 1979/80 to 2018/19
Characteristics of Surface “Melt Potential” over Antarctic Ice Shelves based on Regional Atmospheric Model Simulations of Summer Air Temperature Extremes from 1979/80 to 2018/19 Open
We calculate a regional surface “melt potential” index (MPI) over Antarctic ice shelves that describes the frequency (MPI-freq; %) and intensity (MPI-int; K) of daily maximum summer temperatures exceeding a melt threshold of 273.15 K. This…
View article: Modeling seasonal growth of phototrophs on bare ice on the Qaanaaq Ice Cap, northwestern Greenland
Modeling seasonal growth of phototrophs on bare ice on the Qaanaaq Ice Cap, northwestern Greenland Open
Glacier phototroph blooms on the surfaces of ice sheets and glaciers cause albedo reduction, leading to increased melting rates. We observed seasonal changes in the abundance of phototrophs on the Qaanaaq Ice Cap in northwestern Greenland …
View article: Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica
Temporal variations of surface mass balance over the last 5000 years around Dome Fuji, Dronning Maud Land, East Antarctica Open
We reconstructed surface mass balance (SMB) around Dome Fuji, Antarctica, over the last 5000 years using the data from 15 shallow ice cores and 7 snow pits. The depth-age relationships for the ice cores were determined by synchronizing the…
View article: Data set used in glacier algae and filamentous cyanobacteria models
Data set used in glacier algae and filamentous cyanobacteria models Open
This is a data set for using the glacier algae and filamentous cyanobacteria models (Onuma et al., 2022). The content is as below. - data: observed data (bio-volume, cell count, mineral weight, EC, pH and meteorological conditions) on the …
View article: Data set used in glacier algae and filamentous cyanobacteria models
Data set used in glacier algae and filamentous cyanobacteria models Open
This is a data set for using the glacier algae and filamentous cyanobacteria models (Onuma et al., 2022). The content is as below. - data: observed data (bio-volume, cell count, mineral weight, EC, pH and meteorological conditions) on the …
View article: Data set used in glacier algae and filamentous cyanobacteria models
Data set used in glacier algae and filamentous cyanobacteria models Open
This is a data set for using the glacier algae and filamentous cyanobacteria models (Onuma et al., under review). The content is as below. - data: observed data (bio-volume, cell count, mineral weight, EC, pH and meteorological conditions)…
View article: Combining high resolution atmospheric simulations and land-surface modelling to understand high elevation snow processes in an Himalayan catchment
Combining high resolution atmospheric simulations and land-surface modelling to understand high elevation snow processes in an Himalayan catchment Open
<p>Glaciers are key components of the Asian water towers and provide water to large downstream communities for domestic, agricultural and industrial uses. In the Nepal Himalaya, the Indian Summer Monsoon dominates climate, and result…
View article: The Determination of the Snow Optical Grain Diameter and Snowmelt Area on the Greenland Ice Sheet Using Spaceborne Optical Observations
The Determination of the Snow Optical Grain Diameter and Snowmelt Area on the Greenland Ice Sheet Using Spaceborne Optical Observations Open
The optical diameter of the surface snow grains impacts the amount of energy absorbed by the surface and therefore the onset and magnitude of surface melt. Snow grains respond to surface heating through grain metamorphism and growth. Durin…
View article: Data set used in glacier algae and filamentous cyanobacteria models
Data set used in glacier algae and filamentous cyanobacteria models Open
This is a data set for using the glacier algae and filamentous cyanobacteria models (Onuma et al., under review). The content is as below. - data: observed data (bio-volume, mineral weight, EC, pH and meteorological conditions) on the bare…