A5029511490- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Winter Sports Injuries and Performance
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Ocean Waves and Remote Sensing
- Aerospace Engineering and Energy Systems
- Arctic and Russian Policy Studies
- Isotope Analysis in Ecology
National Institute of Technology, Tomakomai College
2021-2024
National Institute of Polar Research
2017-2022
Hokkaido University
2014-2017
Ice-albedo feedback due to the albedo contrast between water and ice is a major factor in seasonal sea retreat, has received increasing attention with Arctic Ocean shifting cover. However, quantitative evaluation of such feedbacks still insufficient. Here we provide evidence that heat input through open fraction primary driver interannual variations retreat. Analyses satellite data (1979-2014) simplified ice-upper ocean coupled model reveal divergent motion early melt season triggers...
Abstract The Totten ice shelf (TIS) in East Antarctica has received increasing attention recent years due to high basal melt rates, which have been linked a presence of warm modified Circumpolar Deep Water (mCDW) observed at the front. We show that mCDW on‐shelf intrusions towards TIS strengthen when Antarctic Slope Current (ASC) weakens. This demonstrates ASC blocking effect and weakening leads intrusions, as proposed by previous observational studies. interannual variability is controlled...
Abstract Volume, heat, and salt transports through the Soya Strait are estimated based on measurements from high-frequency ocean radars during 2003–15 all available hydrographic data. The baroclinic velocity structure derived climatological geopotential anomaly is combined with sea surface gradient obtained radar-derived velocities to estimate absolute structure. annual-mean volume, 0.91 Sv (1 ≡ 10 6 m 3 s −1 ), 25.5 TW, 31.15 × kg , respectively. volume transport exhibits strong seasonal...
Abstract We created, for the first time, a map of sea ice production in Bering Sea, based on thin‐ice thickness data from Advanced Microwave Scanning Radiometers (AMSR‐E and AMSR2) with heat flux calculation. used AMSR‐E algorithm developed Arctic Ocean some modification. provided 16‐yr set 2002/2003 to 2018/2019 seasons, excepting 2011/2012 season. It is found that Anadyr polynya has by far highest (average 93 km 3 /yr) accounts more than 30% all Sea. The combined Anadyr, Strait, St....
Abstract The quantification of sea ice production in coastal polynyas is a key issue to understand the global climate system. In this study, we directly compared Advanced Microwave Scanning Radiometer-EOS (AMSR-E) data with thickness distribution obtained from mooring observation during winter 2003 off Sakhalin Sea Okhotsk evaluate algorithm for estimation polynyas. By using thermal as target physical quantity, found that relationship between polarization ratio (PR) and can provide an...
Abstract The recent discovery of warm ocean water near the Totten Ice Shelf (TIS) has increased attention to Sabrina Coast in East Antarctica. We report result 6‐day helicopter‐based observations conducted during 61st Japanese Antarctic Research Expedition (JARE61), revealing (0.5–1°C) occupying a large previously unsampled area (116.5°E−120°E) below 550–600 m. Along TIS front, we observe modified Circumpolar Deep Water (mCDW) well above freezing (∼−0.7°C), consistent with previous work....
Abstract Long-term quantification of sea ice production in coastal polynyas (thin areas) is an important issue to understand the global overturning circulation and its changes. The Special Sensor Microwave Imager (SSM/I), which has nearly 30 years observation, a powerful tool for that purpose owing ability detect thin areas. However, previous SSM/I thickness algorithms differ between regions, probably due difference dominant type each region. In this study, we developed algorithm accounts...
Abstract Thin ice thickness algorithms using satellite passive microwave radiometers are frequently used to quantify sea production in coastal polynyas. The objective of this paper is develop and validate a thin algorithm only low-frequency (LF) data (19 37 GHz channels), applicable back 1978 when the Scanning Multichannel Microwave Radiometer (SMMR) observations started. We compared several recent for 22 cases typical polynya events Southern Ocean developed new method discriminate three...
<p><strong>The Totten Glacier in East Antarctica has received increasing attention recent years for its ice loss and warm oceanographic conditions observed at the shelf front. Here, we developed satellite estimates of temporally varying Ice Shelf (TIS) melt rates a high-resolution ocean model. </strong><strong>We show that Antarctic Slope Current (ASC) impedes heat intrusions, on-shelf intrusions enhance when ASC...