Mapping Canada's Arctic Seabed: Data Processing, Management and Distribution Strategies
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1 Mapping Canada's Arctic Seabed: Data Processing, Management and Distribution Strategies Jonathan Beaudoin Ocean Mapping Group University of New Brunswick Fredericton, New Brunswick Arctic Change 2008 Quebec, Dec. 9-12, 2008
2 Aug. 1996, Hanseatic runs aground Antarctica, Dec. 2008, Ushuaia runs aground in poorly charted waters Antarctica, Nov. 2007, Explorer strikes submerged ice, sinks 20 hours later December 11 th, 2008 Arctic Change
3 Global Warming December 11 th, 2008 Arctic Change
4 Charting the Canadian Arctic Archipelago December 11 th, 2008 Arctic Change Photo: Laurel McFadden
5 CCGS Amundsen Mapping Instrumentation C&C Technologies C-NAV GcGPS CTD deployed on rosette Applanix POS/MV 320 ODIM Brooke Ocean MVP 300 MVP 300 towfish Acoustic Instrumentation Kongsberg EM khz multibeam echosounder December 11 th, 2008 Arctic Change Knudsen 3.5 khz sub-bottom profiler
6 CSL Heron Mapping Instrumentation Coda Octopus F-180 IMU C&C Technologies C-NAV GcGPS ODIM Brooke Ocean MVP 30 Acoustic Instrumentation Kongsberg EM khz multibeam echosounder Knudsen 3.5 khz sub-bottom profiler Knudsen December th khz, 2008sidescan and single Arctic beam Change echosounder
7 Western Canadian Arctic Archipelago Coverage Achieved CCGS Amundsen USCGC Healy R/V Marai CSL Heron 60 NM ArcticNet seabed mapping: multiple traverses through the NW Passage...will provide an December 11 th, 2008 Arctic unprecedented Change opportunity 2008 to map bathymetry and seabed geology 7
8 Challenges of Transit Style ArcticNet Mapping 1. Tides 2. Refraction Sources of systematic sounding error 3. Visualization of multibeam/subbottom 4. Timely distribution to multiple ArcticNet researchers December 11 th, 2008 Arctic Change
9 1. Tides Alert Tuktoyaktuk Broughton Island Holman Churchill December 11 th, 2008 Arctic Change
10 WebTide 2D finite-element barotropic ocean circulation models Models can predict tidal currents and sea surface elevation Created and maintained by Ocean Physics Group at Bedford Institute of Oceanography (BIO), Darmouth, NS December 11 th, 2008 Arctic Change
11 WebTide Model Coverage Three models required for Amundsen transits 80+ days of transit/yr Model selection needs to be automated December 11 th, 2008 Arctic Change
12 Coverage Overlap Polygons Coverage polygon for each model guides selection process Polygons designed to: (1) extend beyond model coverage, safely encompassing near shore areas not covered by model (2) abut polygons from neighbouring models, explicitly defining boundary between adjacent model meshes Encoding of decisions in polygon map format removes repeatability issues & fully documents post-processing procedure Large gap Sliver gap December 11 th, 2008 Arctic Change
13 Sound speed 2. Refraction Depth Mapping water depth with multibeam sonar 740 m 785 m Refracted ray path Assumed ray path Depth errors due to refraction if sound speed profile ignored 18 m -6 m ε depth ε dist December 11 th, 2008 Arctic Change
14 ArcticNet CTD sampling sites ( ) Sparsely sampled in 2007 Never sampled! Health Cruise 2007 December 11 th, 2008 Arctic Change
15 Filling the Gaps: Oceanographic Climatologies World Ocean Atlas 2001 GDEMV 3.0 Kliem & Greenberg (2003) December 11 th, 2008 Arctic Change
16 Example Climatology Profiles Lancaster Sound, August 0 Sound speed (m/s) 0 Temperature ( C) 0 Salinity (ppt) CTD cast - WOA01 -GDEM - Kliem December 11 th, 2008 Arctic Change Can we get away with using average conditions instead of actual conditions?
17 The Best Climatology WOA01 (125) GDEM (108) KLIEM (182) December 11 th, 2008 Arctic Change
18 Northwest Passage 3 & 4 Visualization & Distribution December 11 th, 2008 Arctic Change
19 Stripmaps December 11 th, 2008 Arctic Change
20 December 11 th, 2008 Arctic Change
21 Multi-Year Coverage Marai (Japan) Amundsen Healy (USA) Amundsen Amundsen Amundsen Heron Amundsen Amundsen Heron N N N N N N N N N N 25m N 150m 1 NM December 11 th, 2008 Arctic Change
22 ArcticNet Basemaps 2009 Thumbnails for each contributing field season Amundsen Heron Download data A new field season of data can be quickly integrated into the basemaps using a highly automated process, available online within days of return Metadata is available online with data December 11 th, 2008 Arctic Change
23 Summary How to drink from a fire hose UNB processing/delivery model allows for Automated tidal reduction Accelerated SVP post-processing Automated updating of Basemaps website Timely turnaround of transit data products from multiple mapping platforms delivered via lightweight web platform December 11 th, 2008 Arctic Change
24 Conclusion No active Arctic deep water port (yet): future mapping will involve much transit from southern ports Amundsen demonstrates viability of transit style mapping There s much ground to cover: future mapping platforms should log their transit data UNB processing/delivery model can help process and deliver the fire hose of data from several platforms in a timely manner such that vessels can plan their transits to help fill the gaps December 11 th, 2008 Arctic Change
25 Log your transit data we ll happily take it! December 11 th, 2008 Arctic Change
26 Acknowledgements Captains and crews of CCGS Amundsen NSERC and CFI funding of ArcticNet NCE Sponsors of the UNB Chair in Ocean Mapping U.S. Geological Survey Kongsberg Maritime Royal (U.K.) Navy Fugro Pelagos Route Survey Office of the Canadian Navy Rijkswaterstaat December 11 th, 2008 Arctic Change
27 December 11 th, 2008 Arctic Change
28 Uncertainty Attribution Refracted ray path Assumed ray path UNB raytrace simulator used to estimate uncertainty associated with any given climatology Allows for attribution of uncertainty to soundings ε depth ε dist December 11 th, 2008 Arctic Change
29 Evaluation of Climatologies using UNB Raytrace Simulator WOA01 GDEM KLIEM BEST December 11 th, 2008 Arctic Change
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