Physical mechanism for Karenia brevis bloom initiation in Texas

Presentation at the Harmful Algae 2013 conference in October 2013.

Transcript

1. Physical Mechanism for Karenia brevis Bloom Initiation
   in Texas
   Kristen M. Thyng
   Harmful Algae 2013
   Texas A&M University
   Robert D. Hetland, Xiaoqian Zhang, Lisa Campbell
   October 29, 2013
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 1 / 6
   

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2. Mechanism for Aggregation
   Based on R.D. Hetland and L. Campbell, GRL, 2007.
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 2 / 6
   

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3. Mechanism for Aggregation
   Based on R.D. Hetland and L. Campbell, GRL, 2007.
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 2 / 6
   

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4. Mechanism for Aggregation
   x
   x
   x
   Based on R.D. Hetland and L. Campbell, GRL, 2007.
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 2 / 6
   

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5. Difference in Along-shore Winds in HAB Years
   1996 1998 2000 2002 2004 2006 2008 2010 2012
   −3.5
   −3.0
   −2.5
   −2.0
   −1.5
   −1.0
   −0.5
   0.0
   0.5
   Year
   Wind speed (m s-1)
   non-HAB years
   HAB years
   -1.65 m s-1
   Based on M.T. Ogle, Masters Thesis, Texas A&M University, 2012.
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 3 / 6
   

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6. Backward Drifters from Port Aransas during HAB Times
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 4 / 6
   

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7. Backward Drifters from Port Aransas during HAB Times
   Tracking drifters backward from Port Aransas from the autumn into
   summer helps indicate their origin
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 4 / 6
   

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8. Forward Tracking from the South
   Limiting drifters to those near Port Aransas during fall shows that drifters
   in non-HAB years hit the coast or exit the domain before the critical time.
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 5 / 6
   

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9. Proposed Mechanisms
   Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 6 / 6
   

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10. Proposed Mechanisms
    Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 6 / 6
    

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11. Proposed Mechanisms
    x
    x
    x
    Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 6 / 6
    

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12. Proposed Mechanisms
    x
    x
    x
    Kristen M. Thyng (Texas A&M) Harmful Algae 2013 October 29, 2013 6 / 6
    

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