ANGWIN History Mike J. Taylor, Takuji Nakamura, Tracy - - PowerPoint PPT Presentation

ANGWIN History

Mike J. Taylor, Takuji Nakamura, Tracy Moffat-Griffin, Hisao Takahashi, Damian Murphy, Jeong-Han Kim, Pierre- Dominique Pautet, Mitsumu Ejiri, Yucheng Zhao, Jose- Valentin Bageston, C. Wrasse, and ANGWIN Colleagues

4th International ANGWIN Workshop, Sao Jose dos Campos, Brazil, 24-26 April, 2018

ANGWIN: “ANtarctic Gravity Wave Instrument Network”

• Collaborative NSF program with British

Antarctic Survey BAS) to investigate short-period gravity wave climatology over Antarctica.

• All sky Multi-wavelength CCD camera

measuring mesospheric OH, Na, O2 emissions. 19 Winter Seasons of observations:

• 4 at Halley (75.5S) 2000,2001,2005 & 2006.
• 15 at Rothera (67S) 2002-2004, & 2007-to date

All-sky Camera

Early Antarctic OH Observations

2000-to date

Wealth of GW activity over Antarctica! South Pole

?

ANGWIN Concept and Goals

• ANGWIN is a “scientist driven” concept that was

designed to develop a network of Antarctic gravity wave observatories

• Operated by different nations working together in a

spirit of close scientific collaboration. Goals:

• Goal: To measure and understand large-scale

climatology and effects of mesospheric gravity waves

• n the MLT region over Antarctica
• Utilize existing Antarctic Research stations and a

broad range of complementary measurements and new modeling capabilities.

International ANGWIN Instrument Network, 2012

Collaborating institutes from: USA, Japan, UK, Australia, Brazil…

Goal: To measure and understand large-scale climatology and effects of mesospheric gravity waves over Antarctica

ANGWIN “OH Imager” Network (2012)

All-sky IR Imager Halley Davis McMurdo

Three new IR imagers deployed early in 2012, and first winter season coordinated data from 7 cameras around the continent

Examples of IR All-sky OH Data: Davis, Halley & McMurdo Davis Halley McMurdo

Add to existing imagers at Rothera, Syowa, South Pole, and Ferraz

Observing window

1st International ANGWIN Workshop, NIPR, Japan, March, 2013

ANGWIN: General Research Interests

• BAS: stratosphere-mesosphere wave coupling and sources at

Halley and Rothera. Development of a ship-borne OH imager

• NIPR: multi-instruments measurements at Syowa for wave

propagation, momentum deposition and wave source studies using cluster of instruments, including the new PANSY radar.

• AAD: ray-tracing source studies utilizing ANGWIN to

development of Antarctic GW parameterization.

• INPE: gravity waves over the Peninsula with emphasis on the

Drake Passage “hot-spot” region.

• USU: multi-site airglow image data to investigate pan-Antarctic

wave propagation and variability.

• In addition:
• Develop and deploy new instrumentation to enhance the network
• Include High latitude Arctic, complementary studies

Development of New Velocity Analysis Capability

(Matsuda et al., JGR, 2014)

• A novel spectral analysis method for quantifying

the horizontal gravity wave phase velocity distribution.

• Very good comparison of 2011 season integrated

wave power spectrum with individually measured wave events from Syowa.

• Results from 4 ANGWIN sites for selected days in April-May, 2013.

Note the different levels of wave power and differing directionalities.

• Day-to-day variability at a given site can be quantified during season.

2nd International ANGWIN Workshop

High-Latitude Wave Dynamics and Coupling

Welcome to Logan, Utah, 1-3 October, 2014

2nd International ANGWIN Workshop Logan, Utah, October, 2014

Scientists and graduate students from the USA, Japan, U.K., Australia, Canada, Brazil and Germany. Presentations on new ground-based, aircraft and satellite measurements and modeling studies of gravity wave dynamics and coupling in the Antarctic and Arctic regions.

We thank SCOSTEP ROSMIC/ VarSITI program and the US Office of Polar Program sfor their support.

ANGWIN Sites, 2016

Halley Syowa Davis McMurdo South Pole Rothera Palmer Comandante Ferraz McMurdo Jang Bogo

3rd ANGWIN Meeting: 33 delegates at the meeting from 10 different countries

New ANGWIN website (www.bas.ac.uk/projects/angwin) New ANGWIN JGR Special section (Atmospheres and Space Sciences, 2018)

Evolving ANGWIN Objectives 2018…

• The primary objectives of the network will be to:
• Quantify the longitudinal variation in gravity wave activity from the

lower atmosphere into the mesosphere and lower thermosphere at polar latitudes and determine causes.

• Characterize the propagation and dynamical influence of mountain

waves on stratosphere and MLT dynamics.

• Relate gravity waves observed in the stratosphere, mesosphere and

thermosphere to sources such as storms in the Drake’s Passage and Southern Ocean, auroral activity or the polar vortex.

• Study the interaction of gravity waves with global scale waves and their

contribution to the polar vortex dynamical and thermal structure.

• Compare observed polar gravity wave characteristics to parameterized

gravity waves in climate models.

• Determine the potential effects of Antarctic gravity waves on processes

such as polar stratospheric cloud formation.

Hiking in Logan Canyon (2016)

We Welcome You All to the 4th ANGWIN, Brasil, 2018!