OIB - Gulfstream V - JSC 11/08/19 Science Report

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Friday, November 8, 2019
Mission Location: 
Cook Flowlines
Mission Summary: 

Mission: Cook Flowlines
Priority: High
This mission is designed to survey the two main flow lines which feed the Cook Ice Shelf. The eastern flow line addresses a large over-deepening and extends all the way to the ice divide. The western flow line addresses the trunk that feeds the portion of Cook Ice Shelf which collapsed during the observation record. These lines will connect older ICECAP and BAS WISE/ISODYNE surveys, and capture along- flow features in a region that is particularly sensitive to instability.
We rose two hours early in an ultimately vain attempt to survey a sea-ice racetrack mission, which would have underflew ICESat-2 at zero latency. Thanks in part to the Casey meteorologists, who kindly provided MODIS imagery very early in their duty day, we assessed that it was not to be. Instead, we opted for Cook Flowlines, mapping ice upstream of the terminus of this evolving and vulnerable ocean-terminating region. Both flowlines exceed 400 km in length and are among the longest OIB has ever flown. We flew the easternmost flowline first, breakout out of the clouds just in time to start the survey line. We descended through thick clouds offshore to the survey start point, but acquired good surface visibility with a sufficiently high ceiling to operate, 12 nm prior to the line. We broke out of the overcast completely, approximately 30 nm inland, to clear skies and light katabatic winds. The reverse sequence of events occurred during our northbound descent of the western flowline, and we successfully collected data all the way to the coastline on that line as well. All instruments working well and reporting 100% data collection. We performed a ramp pass at 2000 ft AGL on arrival at Hobart.
Today, OIB Project Manager Eugenia De Marco left for home, but not without ensuring we were well equipped to handle the remainder of the campaign. She worked tirelessly across many time zones to prepare for what is shaping up to a very successful campaign and possibly the smoothest stretch of surveying that OIB has ever had. The whole OIB team is very appreciative of her efforts.
Attached images:

  1. Map of today’s mission (John Sonntag / NASA)
  2. Edge of the Cook Ice Shelf, under heavy overcast (John Sonntag / NASA).
  3. Subtle, periodic surface features around 72.2S 145.9E that were only visible with certain sun angles (John Sonntag / NASA).
  4. Our emotional support devil, comfortably wedged beneath the primary navigation display (John Sonntag / NASA).

Edge of the Cook Ice Shelf, under heavy overcast

Subtle, periodic surface features around 72.2S 145.9E that were only visible with certain sun angles

Our emotional support devil, comfortably wedged beneath the primary navigation display

Related Flight Report: 

Gulfstream V - JSC 11/07/19 - 11/08/19

Flight Number: 
Payload Configuration: 
Nav Data Collected: 
Total Flight Time: 
10 hours
Flight Segments: 
Start:11/07/19 19:56 Z Finish:11/08/19 05:56 Z
Flight Time:10 hours
Log Number:205003PI:Joseph MacGregor
Funding Source:Bruce Tagg - NASA - SMD - ESD Airborne Science Program
Purpose of Flight:Science
Miles Flown:4400 miles
Flight Hour Summary: 
Flight Hours Approved in SOFRS350
Total Used248.4
Total Remaining101.6
205003 Flight Reports
Date Flt # Purpose of Flight Duration Running Total Hours Remaining Miles Flown
10/21/19 - 10/22/19GV-51Transit5.318.6331.42300
10/23/19 - 10/24/19GV-53Science10.235.8314.24400
10/24/19 - 10/25/19GV-54Science10.145.9304.14400
10/26/19 - 10/27/19GV-55Science10.456.3293.74500
10/27/19 - 10/28/19GV-56Science10.266.5283.54400
10/28/19 - 10/29/19GV-57Science10.176.6273.44400
10/29/19 - 10/30/19GV-58Science1086.6263.44400
10/31/19 - 11/01/19GV-59Science10.296.8253.24400
11/02/19 - 11/03/19GV-60Science10.6107.4242.64600
11/03/19 - 11/04/19GV-61Science9.61172334200
11/04/19 - 11/05/19GV-62Science10.3127.3222.74500
11/05/19 - 11/06/19GV-63Science10.2137.5212.54400
11/07/19 - 11/08/19GV-64Science10147.5202.54400
11/08/19 - 11/09/19GV-65Science9.51571934100
11/09/19 - 11/10/19GV-66Science10.2167.2182.84400
11/13/19 - 11/14/19GV-67Science10.2177.4172.64400
11/14/19 - 11/15/19GV-68Science10.4187.8162.24500
11/16/19 - 11/17/19GV-69Science9.9197.7152.34300
11/17/19 - 11/18/19GV-70Science9.9207.6142.44300
11/18/19 - 11/19/19GV-71Science10.3217.9132.14500
11/19/19 - 11/20/19GV-72Science10.4228.3121.74500
11/20/19 - 11/21/19GV-73Science3.5231.8118.21500

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