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Normal (and Non-Normal) Modesof Variability:
The Hendershott Supremacy
Normal (and Non-Normal) Modesof Variability:
The Hendershott Supremacy
Hendershott SymposiumSumner Auditorium
December 1, 2006
Hendershott SymposiumSumner Auditorium
December 1, 2006
Arthur J. MillerArrival: September 1980
Ph.D. June 1986
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My Lucky Day in Myrl’s OfficeMy Lucky Day in Myrl’s Office
NSF ProposalNormal Modes of the Pacific: Observations and Theory
Hendershott and Luther
Objectives:1) Compute Platzman’s Shallow-Water Barotropic Vorticity Modes
- Explain broadband 4-6 day peak in Pacific sea level coherency2) Force Holland’s QG OGCM with Fluctuating Winds and Long-period Tides
- Identify “damping” effect of mesoscale turbulence on vorticity modes
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Punching card decksNCAR Computer RoomJuly 1981
Off to NCAR with Myrl to learn the ropesof supercomputing….
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Rhines, Holland, McWilliams, Lorenz, …..Rhines, Holland, McWilliams, Lorenz, …..
MCH Mentoring Tip #1: Introduce students to The Big Wheels
as soon as possible!
MCH Mentoring Tip #1: Introduce students to The Big Wheels
as soon as possible!
-Some of the superstarscavalierly introduced to an awestruck AJM during first year at Scripps
-Some of the superstarscavalierly introduced to an awestruck AJM during first year at Scripps
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NASA Tides Workshop, U of Chicago, April 1982(Myrl and Doug did not want to go.)
NASA Tides Workshop, U of Chicago, April 1982(Myrl and Doug did not want to go.)
MCH Mentoring Tip #2: Send students to scientific meetings
as soon as they have results!
MCH Mentoring Tip #2: Send students to scientific meetings
as soon as they have results!
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NASA Tides Workshop, U of Chicago, April 1982- with Platzman, Cartwright, McGoldrick, Rao,Fultz, Schwiderski, Fujita, Kuo et al.
NASA Tides Workshop, U of Chicago, April 1982- with Platzman, Cartwright, McGoldrick, Rao,Fultz, Schwiderski, Fujita, Kuo et al.
“Excitation of Normal Modes in a Turbulent Ocean“ (talk by a 2nd-year Ph.D. student)“Excitation of Normal Modes in a Turbulent Ocean“ (talk by a 2nd-year Ph.D. student)
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The Thesis Proposal for Qualifying Exam: April, 1983
Six references!
Two Shoddy Figures
One and a half pages!
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Checklist for finding Myrl (c. 1984):1) Office (check if unlocked: If Yes!, then)2) IGPP Reading Room (cookies and CSM)3) IGPP Conference Room (binoculars)4) IGPP Computer Room 5) Check office again6) SIO Library7) Check office again (locked!)8) Riding off in his beat-up old blue VW Bug
Checklist for finding Myrl (c. 1984):1) Office (check if unlocked: If Yes!, then)2) IGPP Reading Room (cookies and CSM)3) IGPP Conference Room (binoculars)4) IGPP Computer Room 5) Check office again6) SIO Library7) Check office again (locked!)8) Riding off in his beat-up old blue VW Bug
MCH Mentoring Tip #3: Have lots of hiding places!MCH Mentoring Tip #3: Have lots of hiding places!
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MCH Mentoring
Tip #4: Leave a big stack of mail in your box, so people
will think you are gone, and leave
you alone
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The Eventual Dissertation ResultsThe Eventual Dissertation Results
Chapter 3: On the fortnightly and monthly tides
Chapter 1: Miller (1986, JPO)
Chapter 2: Miller, Holland and Hendershott (1987, GAFD)
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The Dissertation ResultsThe Dissertation Results
1) Miller (1986, JPO)- QG Beta-modes couple to small-scale topo-modes
- Multiple peaks of non-degenerate beta-mode structures occur far from topographic features
- Strong friction not needed to explain broadbanded peak
- Observational evidence?
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In Search of the Resonant Barotopic Vorticity Mode….
In Search of the Resonant Barotopic Vorticity Mode….
Miller, Lermusiaux and Poulain (1996, JPO)- Resonant QG mode on the Iceland-Faeroe Ridge (2 days)
- Array of currents meters-Damping rate: 13 days
Pierini (1996, JGR)- Resonant topographic mode in the Straight of Sicily (5 days)
- Single current meterFu, Cheng and Qiu (2001, JPO)
- Resonant topographic mode in the Argentine basin (25 days)- TOPEX observations
- Lamb’s solution (1879)
f/H for IFR 2-day mode for IFR
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The Dissertation ResultsThe Dissertation Results
2) Miller, Holland and Hendershott (1987, GAFD)- QG turbulence excites basin-scale vorticity modes
- Comparable to wind-forced spectra in eastern basin- Important energy sink for WBC’s?
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In Search of Radiating Barotropic Rossby Waves….
In Search of Radiating Barotropic Rossby Waves….
BARX Proposal with Luther and Hendershott (Pending at NSF)- ROMS EGCM reveals corridors of QG energy emanating from Gulf Stream
- Bermuda Rise and Mid-Atlantic Ridge roughness cordons the radiation - Higher frequency activity trapped to Bermuda Rise
Deep v-velocity variance(20-50d band) (8-11d band)
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The Dissertation ResultsThe Dissertation Results
Chapter 3: On the fortnightly and monthly tides- Large-scale response in low-latitude Pacific NOT explicable
in terms of vorticity wave resonances- Friction can suppress effects of topographic roughness
- Weak friction admits wavelike repsonse, unlike observed- Strong friction admits time-dependent Stommel solution
which is too weak
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Years later….Finally figuring out the LPTYears later….Finally figuring out the LPT
Miller, Luther and Hendershott (1993, JPO)- Resonant Rossby waves or nearly equilibrium gravity waves?
- Global scale sloshing explains Pacific amplitude/lag pattern Ray and Cartwright (1992, Proc. IEEE)
- Confirmed admittance pattern from satellite altimetryPonte (1997, JPO)
- Confirmed interbasin mass adjustment to 5-day global pressure wave forcingWunsch, Haidvogel, Iskandarani and Hughes (1997, ProgOc)
- Challenged the importance of gravity wavesEgbert and Ray (2003, JPO)
- Confirmed interbasin exchange as important process
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Celebrating the Long-Period Tides PaperCelebrating the Long-Period Tides Paper
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MCH Mentoring Tip #5: Know Your Wines!
And Know Them Well!!!
MCH Mentoring Tip #5: Know Your Wines!
And Know Them Well!!!
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The Dissertation Results?The Dissertation Results?
Chapter 4: NO WAY!!!! - “Topographic Rossby waves over a random lattice of seamounts”
- Adopt techniques from solid state quantum mechanics theory- Supported by numerical solutions over increasingly random relief
Hendershott and Miller (JFM, 1988, submitted)Accepted pending minor revisions…..STILL!
MCH Mentoring Tip #6: Don’t let Myrl be First Author! It may NEVER be published!!!
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Cap and GownUCSDJune 1986
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“Well, you could look at it that way…but I prefer to think about it this way….”“Well, you could look at it that way…but I prefer to think about it this way….”
MCH Mentoring Tip #7: Never tell your students that they are wrong!
MCH Mentoring Tip #7: Never tell your students that they are wrong!
-MCH to AJM (heard many times in the 1980’s)-MCH to AJM (heard many times in the 1980’s)
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MCH Mentoring Tip #8:
Be Super Cool!
…with Supreme Dignity!…with Supreme Dignity!Above All…
Stay Young!!Above All…
Stay Young!!
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The Picture of… The Hendershott
Supremacy
The Picture of… The Hendershott
Supremacy