Arctic Sea Ice Decline in the 2010s: The Increasing Role of the Ocean—Air Heat Exchange in the Late Summer
Abstract
:1. Introduction
2. Data and Methods
3. Ice and Hydrometeorological Conditions in the Central Laptev Sea in Summer
3.1. Ice Conditions
3.2. Hydrographic Conditions
3.3. Weather Conditions
3.4. Ocean–Air Energy Exchange
3.5. Heat Accumulation in the UML
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix
A.1. Observational Techniques
Observed Parameter | Measurement Instrument | |
---|---|---|
NABOS-2013 | NABOS-2015 | |
Fluctuations of air temperature and three components of wind speed | Acoustic three-component anemometer Gill Wind Master, installed at the foredeck, 10 Hz frequency | Acoustic three-component anemometer METEK Sonic-3 Scientific, installed at the foredeck, 10 Hz frequency |
Upward and downward fluxes of the shortwave and longwave radiation | Instrument cluster Kipp & Zonen (two pyrgeometers CGR-3 and two pyranometers CMP-21), installed at the crossbar on the upper deck, 1 min frequency | |
Meteorological parameters (temperature, pressure, humidity, wind speed) | (1) Aanderaa AWS2700 automatic weather station (spaced apart left and right shipboards), 1 min frequency (2) Ship weather station | (1) Marine automatic weather station Airmar WX150 with an internal GPS, compass, inclinometer, and accelerometers, installed at the foredeck, 1 Hz frequency (2) Ship weather station |
Characteristics of ship movement (speed, location, inclination) | Three-axis accelerometer ADXL330, inclinometer, GPS-receiver of Garmin 17N standard | |
Sea surface temperature | Infrared radiometer HEITRONICS KT19.82, 1 Hz frequency | |
Air temperature profile in the lower troposphere | Microwave temperature profiler MTP-5, installed at the upper deck at a height of 25 m above sea level, 5 min frequency, vertical resolution 50 m | |
Vertical range 0–600 | Vertical range 0–1000 |
A.2. Data Processing Techniques
A.3. Observed Time Series of Meteorological Parameters and Their Comparison with Reanalysis Data
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Year | Date-1 | Date-2 | Lat., ° | Long., ° | Date of Opening, ±5 Days | Date of Closing, ±5 Days | Duration of Open Water, ±10 Days | Mean Distance to the Ice Edge, km |
---|---|---|---|---|---|---|---|---|
2003 | 01.09 | 06.09 | 78.445 | 125.662 | n/a | n/a | n/a | n/a |
2005 | 14.09 | 20.09 | 78.464 | 125.668 | 25.08 | 05.10 | 40 | 60 |
2013 | 27.08 | 07.09 | 78.395 | 125.785 | 30.08 | 05.10 | 35 | 122 |
2015 | 02.09 | 19.09 | 78.460 | 125.930 | 30.07 | 20.10 | 80 | 193 |
Region of Averaging | Year | SAT | SST | ΔT = SST − SAT |
---|---|---|---|---|
Average over ice-free water along the whole cruise tracks | 2013 | 0.68 | 1.03 | 0.34 |
2015 | −1.33 | 1.08 | 2.41 | |
Average over ice-free water in Laptev sea region (100–150 °E) | 2013 | 0.35 | 0.43 | 0.08 |
2015 | −2.14 | 0.41 | 2.55 |
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Ivanov, V.; Varentsov, M.; Matveeva, T.; Repina, I.; Artamonov, A.; Khavina, E. Arctic Sea Ice Decline in the 2010s: The Increasing Role of the Ocean—Air Heat Exchange in the Late Summer. Atmosphere 2019, 10, 184. https://doi.org/10.3390/atmos10040184
Ivanov V, Varentsov M, Matveeva T, Repina I, Artamonov A, Khavina E. Arctic Sea Ice Decline in the 2010s: The Increasing Role of the Ocean—Air Heat Exchange in the Late Summer. Atmosphere. 2019; 10(4):184. https://doi.org/10.3390/atmos10040184
Chicago/Turabian StyleIvanov, Vladimir, Mikhail Varentsov, Tatiana Matveeva, Irina Repina, Arseniy Artamonov, and Elena Khavina. 2019. "Arctic Sea Ice Decline in the 2010s: The Increasing Role of the Ocean—Air Heat Exchange in the Late Summer" Atmosphere 10, no. 4: 184. https://doi.org/10.3390/atmos10040184