User talk:DanHobley

Welcome!

Hello, DanHobley, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

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In particular, thank you so much for your rewrite of geomorphology. It looks a world better! Awickert (talk) 06:00, 3 August 2010 (UTC)

Dan, I've been working on some Mars articles for wikipedia for a little while, and I wanted to compliment you on the outflow channel article. Frankly I've found a lot of the Mars articles wanting from a scientific standpoint. It's good to see some high quality work here. I've slowly been trying to rewrite and expand some of the Mars topics. Your standard is going to be hard to live up to! Schaffman (talk) 20:13, 28 March 2011 (UTC)

Valley Network Article

Hi Dan

I looked over your article on valley networks. Once again, it’s refreshing to see a Mars article written by someone with a deep knowledge of the subject. I hope you can continue to add your expertise to the Mars project here. I know you’re extremely busy with you real postdoc work. Most of my comments on the article are questions I have myself, and may or may not be suitable to address in the article. If I tried to add everything I wanted to add in the articles I’ve written, I’d never finish them. Anyway, here are some thoughts:

• You asked me to review particularly the last part of the article. When you say: “failings in the parameterization of CO2 clouds,” I assume you mean problems in the Kasting (1991) model in which a dense CO2 atmosphere forms CO2 clouds that cool the surface below freezing. If so, maybe you could state this explicitly in paragraph 2 of scenario 3 (Warm, Wet Mars). Something like (my wording here): Unfortunately, models of an early dense CO2 atmosphere predict that CO2 clouds would form, thus reducing the magnitude of the greenhouse effect and causing surface temperatures to fall below the freezing point of water. (Ref., Kasting, J.F., 1991, Icarus, 94, 1–13.)

• In scenarios 1 and 2, you might want to mention that the heads of many valley networks occur at high points near crater rims where discharge from aquifers is unlikely because of the extremely limited area for recharge, low hydraulic head, etc.

• Boyce (2008) differentiates valley networks from so called trunk or longitudinal valleys (e.g. Nirgal Vallis). Since this was a popular work (Smithsonian Book of Mars), he didn’t provide journal references. I’m curious to know how these valleys are related to the type valley networks (e.g., Warrego), both in morphology, ages, possible existence of transitional forms, etc. (Maybe that’s another article, I don’t know.)

• Finally, you might consider adding to your “Form” section that the longitudinal profiles of terrestrial stream valley networks are concave upward, with steep slopes at the source and shallow slopes distally. Yet on Mars, the longitudinal profiles tend to decrease linearly, following regional slope (Carr, 2006, Surface of Mars, p. 140). This would be an argument against a prolonged period of global rainfall and fluvial erosion in the Noachian(?)

Overall, I think the article is great as stands. My knowledge of geomorphology is limited to undergrad courses I took years ago, so when it comes to this subject, you are the true expert here. I apologize if any of my comments are based on a misunderstanding of the subject matter. I’m pleased to see that you are working with Alan Howard. I think his paper with Bob Craddock on The Case for Rainfall on early Mars is a classic. I read it a while ago, so I’m not sure how their arguments have stood up over that last decade. But I liked the overall philosophy: let’s look at the geologic evidence and see where it leads.

Would you mind allowing me to correspond with you via email? It’s a pleasure to exchange ideas with someone who is active in the planetary science field. My email is schafft@cinci.rr.com.

Again, excellent article and best wishes.

Tom Schaffman (talk) 16:00, 31 March 2011 (UTC)

Quick question for you

Hi Dan. I'm thinking about expanding the stub on Enipeus Vallis, located between Alba Patera and Tempe Terra. The only reference material I could find was a 1995 LPSC abstract and a 2001 geologic Map of Tempe/Mareotis region, both by Henry Moore. Off the top of your head, do you know on any other paper that could help? Michael Carr (Water on Mars, 1996) has mapped the Vallis as a valley network, but it has features to me that resemble an outflow channel (anastomosing channels, streamlined islands). Cheers and best, Tom. Schaffman (talk) 18:55, 24 April 2011 (UTC)

Thanks, Dan!

Schaffman (talk) 14:16, 25 April 2011 (UTC)

Request to review brief section on Alba Mons article.

Hi Dan. I just completed an article on Alba Mons. It includes a brief (two paragraph) description of valley networks and gullies on the volcano's northern flank. I don't know how familiar you are volcano valleys on Mars. but thought you could take a look at it to see if I'm not missing something major that should be included or info that needs updating. My main concern at this point is to keep the article as short and as simple as possible. To this end, I'm still editing, and the article is in quasi-draft form. Thanks for your help--Tom. Schaffman (talk) 14:04, 3 June 2011 (UTC)

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Levee

There is a requested move, if u didn't see it yet: levee → dyke, is this really a geologist term? Cheers --Chris.urs-o (talk) 13:03, 3 September 2012 (UTC)

Hi Chris, thanks for letting me know. I've stuck in my 2 cents worth on the discussion. Punchline: dyke is not appropriate for the technical content in the article; levee is correct. DanHobley (talk) 22:39, 4 September 2012 (UTC)

The discussion is a lil bit weird, I may say ;) Cheers --Chris.urs-o (talk) 05:39, 5 September 2012 (UTC)

Talkback

Hello, DanHobley. You have new messages at RockMagnetist's talk page.
Message added 17:18, 17 September 2012 (UTC). You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

RockMagnetist (talk) 17:18, 17 September 2012 (UTC)

Thanks

For your good and dedicated work. Alanscottwalker (talk) 21:52, 17 September 2012 (UTC)

Thanks! I'm going to lurk for a while now, and just let those changes get some eyes on them. Someone come get me is anything exciting is happening.DanHobley (talk) 21:59, 17 September 2012 (UTC)

A barnstar for you!

	The Editor's Barnstar
	For doing what an editor is supposed to be doing on Lake Michigan–Huron. Tijfo098 (talk) 22:01, 17 September 2012 (UTC)

I second that. I know you felt frustrated by the initial response, but you did more for the article than everyone else put together. RockMagnetist (talk) 01:39, 18 September 2012 (UTC)

I third it. Excellent work. Pfly (talk) 04:23, 18 September 2012 (UTC)

Twice

You accidentally double posted part of a post, so I removed it here: [1]. I compared the text beforehand to make sure it was an exact duplicate. IRWolfie- (talk) 23:20, 17 September 2012 (UTC)

Thanks! My bad. DanHobley (talk) 23:21, 17 September 2012 (UTC)

A barnstar for you!

	The Special Barnstar
	I couldn't find a "Never underestimate the power of moving water" barnstar, and I'm too lazy to make one. If I ever meet you in real life, a beverage of your choice is on me. I wish I could be more encouraging about Wikipedia, but I'm cynical, and not sure why I bother. But thanks for the reality. Curtis Clark (talk) 00:57, 18 September 2012 (UTC)

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