A RM W est A ntarctic R adiation E xperiment A Joint US NSF-DOE ARM - - PowerPoint PPT Presentation

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A RM W est A ntarctic R adiation E xperiment A Joint US NSF-DOE ARM - - PowerPoint PPT Presentation

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A RM W est A ntarctic R adiation E xperiment A Joint US NSF-DOE ARM Mobile Facility Campaign Ryan Scott, Scripps WAIS Divide site scientist Dan Lubin, Scripps AWARE PI, Polar clouds and radiation David Bromwich, Ohio State Polar meteorology

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SLIDE 1

ARM West Antarctic Radiation Experiment

Ryan Scott, Scripps

WAIS Divide site scientist

Dan Lubin, Scripps

AWARE PI, Polar clouds and radiation

David Bromwich, Ohio State

Polar meteorology

Andrew Vogelmann, BNL

Polar clouds and radiation

Johannes Verlinde, Penn State

Radar meteorology

Lynn Russell, Scripps

Aerosol chemistry and physics

A Joint US NSF-DOE ARM Mobile Facility Campaign

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 2

Scientific Motivation for AWARE

(above) Annual-mean air temperature time series from the Byrd AWS in central West Antarctica (Bromwich et al. 2013) Trend: 0.42±0.24oC/decade (left) Antarctic ice shelf thickness change from 1994-2012 (Paolo et al. 2015)

Byrd

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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Scientific Motivation for AWARE

  • Rapid warming of West Antarctica linked to grounded

ice loss and global sea-level rise

  • WAIS mass loss currently driven by warm seawater
  • Satellite microwave record also reveals sporadic, extensive

surface melt events (e.g., January 2005)

  • No comprehensive atmospheric data since the decade

following the 1957-58 IGY

  • Warming likely driven by advection of warm and moist Southern Ocean air masses
  • Dynamical mechanisms vary with season, involve complex teleconnections with (sub)tropical SST
  • Atmospheric forcing projected to become a dominant contributor to WAIS mass loss

(DeConto and Pollard 2016) similar to Greenland (van den Broeke et al. 2016)

  • Surface meltwater known to alter Antarctic Peninsula and Greenland ice dynamics
  • Need to understand the WAIS surface energy budget and the influence of clouds!

JANUARY 2005

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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ARM offers the most advanced set of atmospheric instrumentation available for climate research worldwide

Each instrument has a mentor Pre- and post-season calibration

AWARE Central Facility: McMurdo Station, Ross Island Extended Facility: WAIS Divide Ice Camp

The ARM Program

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 5

WAIS Divide Ross Island

Meteorological connection between AWARE sites

WAIS Divide Ross Island

Scott et al. 2017, Journal of Climate

Longitude [degrees E]

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 6

Deployments well-situated to capture advective warming

Nicolas and Bromwich 2014, Journal of Climate

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 7

WAIS Divide Ice Camp

4 Dec 2015 - 18 Jan 2016

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 8

Micropulse (Depolarization) Lidar SIO Spectroradiometer Sky Radiation Suite (SKYRAD) Balloon-Borne Sounding System

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SLIDE 9

Micropulse (Depolarization) Lidar SIO Spectroradiometer Sky Radiation Suite (SKYRAD) Balloon-Borne Sounding System

calendar day of 2015 345 346 347 348 349 350 351 352 broadband irradiance [W m-2] 140 160 180 200 220 240 260

Incoming longwave radiation

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SLIDE 10

Micropulse (Depolarization) Lidar SIO Spectroradiometer Sky Radiation Suite (SKYRAD) Balloon-Borne Sounding System

WAIS Divide, Antarctica

spectrum #

500 1000 1500 2000 2500 3000 3500 4000

wavelength [nm]

350 400 450 500 550 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

[W m-2 nm-1]

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SLIDE 11

Micropulse (Depolarization) Lidar SIO Spectroradiometer Sky Radiation Suite (SKYRAD) Balloon-Borne Sounding System

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SLIDE 12

Micropulse (Depolarization) Lidar SIO Spectroradiometer Sky Radiation Suite (SKYRAD) Balloon-Borne Sounding System

WAIS Divide MPL depolarization ratio

seconds

1000 2000 3000 4000 5000 6000 7000 8000

range [m]

2700 2400 2100 1800 1500 1200 900 600 300

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

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SLIDE 13
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WAIS Divide, Antarctica JAN 2016

seconds [x10]

1000 2000 3000 4000 5000 6000 7000 8000

range [m]

2700 2400 2100 1800 1500 1200 900 600 300

0.5 1

[x100%]

spectrum #

200 400 600 800 1000 1200 1400

1.6 µm window

0.05 0.1

[W m-2 nm-1] spectrum # 200 400 600 800 1000 1200 1400 1.6 µm flux [W m-2] 5 10 15 20 25 spectrum # 200 400 600 800 1000 1200 1400 slope 1534-1593 nm ×10-5

  • 15
  • 10
  • 5

5

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SLIDE 15

AMF2 on Ross Island

November 2015 - December 2016

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 16

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 17

AGU Fall 2016 - Observations for Improving Polar Weather and Climate Predictions

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SLIDE 18

AWARE data are YOUR data!

ARM data archive: www.arm.gov Free and open access worldwide More information + time-lapses + photos at: scripps.ucsd.edu/expeditions/aware