Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Nansen question
    From: George Huxtable
    Date: 2009 Dec 12, 15:23 -0000

    There's an alternative to explaining Ekman transport. As with many other
    topics, it's been discussed previously on this list (well, on its
    predecessor, actually- Nav-L)  If you look at the exchanges around 19 Jan
    2005, you will find discussions of Ekman spiral, including some particularly
    wise words emanating from "Gadus"; actually the remarkably well-informed
    Trevor Kenchington.
    
    I would be interested to read Nansen's words on that topic. How did you get
    to them?
    
    Yours, George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ----- Original Message -----
    From: "Apache Runner" 
    To: 
    Sent: Saturday, December 12, 2009 2:47 PM
    Subject: Re: [NavList 11097] Nansen question
    
    
    | Thanks, George.   In the "Some Results..." article, there is the first
    | actual mention of the idea that led to Ekman transport.   It took a bit of
    | digging to get there.
    |
    | The Ekman theory is a reasonable approximation, but it leaves out all
    sorts
    | of issues like the effect of turbulence etc.   It goes a long way to
    | explaining the structure of gyres in oceanic currents, but it's not the
    full
    | story.
    |
    | If anyone's interested, I can post the quote from Nansen, but then I'd
    have
    | to explain Ekman transport....which might be more than you want.
    |
    | Thanks,
    |
    | John Huth
    |
    |
    | On Fri, Dec 11, 2009 at 7:00 AM, George Huxtable  wrote:
    |
    | > A follow-up to my earlier posting, which attempted to answer Apache
    | > Runner's
    | > question about the origin of the Ekman theory of wind drift.
    | >
    | > I suggested that Nansen's publication "Some results of the Norwegian
    Arctic
    | > Expredition 1893-96" might be productive, but a look in Abebooks tells
    me
    | > that slim volume is just reprinted from an item in the Journal of the
    Royal
    | > Geographical Society, presumably for 1897. So that may be findable in an
    | > academic library.
    | >
    | > But I've also discovered that the results were gathered into a series of
    | > (at
    | > least) 6 volumes, "The Norwegian North Polar Expedition 1893-1896
    | > Scientific
    | > Results Vol 1", etc, edited by Nansen (presumably in English). These
    were
    | > reprinted by Greenwood Press, New York, around 1970, so should be
    available
    | > in libraries. And I see that Ekman made at least one contribution to
    that
    | > series (on "Dead-water", in vol 3).
    | >
    | > I remember learning about the Ekman theory, in an oceanography course in
    | > the
    | > early 1950s (and being a bit sceptical).
    | >
    | > George.
    | >
    | > contact George Huxtable, at  george{at}hux.me.uk
    | > or at +44 1865 820222 (from UK, 01865 820222)
    | > or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    | > ----- Original Message -----
    | > From: "George Huxtable" 
    | > To: 
    | > Sent: Friday, December 11, 2009 12:47 AM
    | > Subject: Re: [NavList 11079] Nansen question
    | >
    | >
    | > | Yes, it was on the Fram expedition of 1893-96, , when Nansen made the
    | > | observation sthat led to the Ekman spiral, according to "The Oceans",
    | > | Sverdup, Johnson, and Fleming (1942), page 492.
    | > |
    | > | I have the two volumes of Nansen's "Furthest North", but a very-quick
    | > scan
    | > | from the index has only led to passages which seem to imply that ice
    was
    | > | drifting straight downwind, not at an angle. But Nansen says that
    further
    | > | publications will follow with the scientific details. He later
    published
    | > | which might be
    | > | productive, but I don't know it.
    | > |
    | > | George
    | > |
    | > | contact George Huxtable, at  george{at}hux.me.uk
    | > | or at +44 1865 820222 (from UK, 01865 820222)
    | > | or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    | > | ----- Original Message -----
    | > | From: "Apache Runner" 
    | > | To: 
    | > | Sent: Thursday, December 10, 2009 11:35 PM
    | > | Subject: [NavList 11077] Nansen question
    | > |
    | > |
    | > || Does anyone know the original publication of Nansen's work that led
    to
    | > the
    | > || Eckman theory of currents?
    | > ||
    | > || As I recall, he noticed that icebergs moved at some angle (30-40
    | > degrees)
    | > || with respect to the direction that the wind was blowing them and
    deduced
    | > || that it was due to the combination of the wind and the Coriolis
    effect.
    | > || That observation was the basis of the Eckman theory.   I'm curious
    about
    | > | the
    | > || expedition this was sighted on.    I think it was the famous Polar
    drift
    | > | of
    | > || the Fram, but I'm not sure.   I don't recall seeing it written in
    | > Furthest
    | > || North (quite a tale, too), so I'm assuming it was a scientific
    | > | publication.
    | > ||
    | > || Anyone know?
    | > ||
    | > || --
    | > || NavList message boards: www.fer3.com/arc
    | > || Or post by email to: NavList@fer3.com
    | > || To unsubscribe, email
    NavList+unsubscribe@fer3.com
    | > |
    | > | --
    | > | NavList message boards: www.fer3.com/arc
    | > | Or post by email to: NavList@fer3.com
    | > | To unsubscribe, email
    NavList+unsubscribe@fer3.com
    | >
    | > --
    | > NavList message boards: www.fer3.com/arc
    | > Or post by email to: NavList@fer3.com
    | > To unsubscribe, email
    NavList+unsubscribe@fer3.com
    | >
    |
    | --
    | NavList message boards: www.fer3.com/arc
    | Or post by email to: NavList@fer3.com
    | To unsubscribe, email NavList+unsubscribe@fer3.com
    
    --
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site