1 is just the front moving back and forth. Sometimes it hits the bottom 



2 at 100 meters, sometimes it is 200 meters. 



3 What you really see is a zone of large variability of temperature. 



4 I'd say that is the distinguishing characteristic, not the mean 



5 temperature, because sometimes it's in shelf water and sometimes it's in 



6 slope water. That 200 meters, the zone between 100 and 200 is really 



7 where the toe of that front always hits, plus or minus. 



8 DR. NEFF: Certainly, in the Georges Bank area, the bottom water 



9 temperature there is much less variable than the higher water on the 



10 bank. 



11 DR. BUTMAN: Right. 



12 DR. NEFF: Station 15 was the most variable, the lowest and the 



13 highest temperatures. The deeper you went, the less variable it was. 



14 Likely, the heads of the canyons are winter refuges for a lot of animals 



15 who know that lobsters make major migrations seasonally and quite 



16 possibly congregate there because it's a little warmer and nicer in the 



17 wintertime. 



18 DR. BUTMAN: Before we have a coffee break, let me just put the 



19 last one up here. We had a lot of discussion about sedimentary 



20 environments of canyons are similar or not similar. 



21 I was obviously getting tired this morning when I was writing this 



22 out, so this is not quite as detailed, but based both on the texture and 



23 on currents--and, again, the primary data is in Oceanographer and 



24 Lydonia, although. Page, I think we can expand that to a much wider 



25 range of canyons. 



26 Really, they are not similar. It is very difficult to say all 



27 canyons are erosional, all canyons are depositional . I think, from the 



28 data base that we discussed yesterday, we really have two canyons that 



29 we know something about in detail, Lydonia and Oceanographer. 



30 The last thing I had was just a list of the limitations of the 



31 available data. Do you want to do that now or do you want to take a 



32 short break? 



33 DR. HECKER: Let's take a break. 



34 DR. BUTMAN: All right. 



209 



