[Exports_pi] EXPORTS Cruise Parameters Team Telecom - Tuesday Aug 15 - 9amPT/NoonE

Fri Aug 11 12:12:05 PDT 2017

Hi Cecile and colleagues,

Thanx!  That’d be very helpful. 

A good summary of expected conditions if folks are interested is the Westberry et al. paper in GBC last year I think.  http://people.eri.ucsb.edu/~davey/MyPapers/Westberry_et_al-2016-Global_Biogeochemical_Cycles.pdf <http://people.eri.ucsb.edu/~davey/MyPapers/Westberry_et_al-2016-Global_Biogeochemical_Cycles.pdf>  

Erik Fields has put together a folder of monthly merged satellite images for me for the region as well as movies of these data in a FTP directory.  We’re using the GSM model merging method in an attempt to squeeze about all there is out of the few clear images for this region.  See ftp://ftp.eri.ucsb.edu/pub/org/oceancolor/fields/Exports/gsmPsdAnimations/ <ftp://ftp.eri.ucsb.edu/pub/org/oceancolor/fields/Exports/gsmPsdAnimations/>  You probably want to focus on the OSP_larger slides.  There are two types LargerBox (log(Chl), log(BBP), log(CDM) and the slope of the PSD from the Kostadinov method for SeaWiFS only) and ospRatiosLargerBoxDate (log(PhtytoC from BBP), log(BBP/aph; aph from Chl), %CDM_total_abs and Chl/PhytoC).  The images directory holds all the images.  These are rough and only for internal uses at this time…  

There are interesting things to talk about. See the summary for monthly mean merged images for log(Chl), log(BBP), log(CDM) and the slope of the PSD at https://people.eri.ucsb.edu/~davey/tmp/August%20Imagery_OSP.pdf <https://people.eri.ucsb.edu/~davey/tmp/August%20Imagery_OSP.pdf> (too big to email!!) The August images show hints of a persistent EW gradient with reduced Chl and BBP west of 140W.  There are also interesting structures on >200 km scales and a good deal of interannual variation. August 2008 is highly anomalous and the causes of the anomalous 2008 bloom are discussed in Roberta’s 2010 GRL paper attached here.    

I am afraid too much of the small scale spatial variations (< 100 km) is due to aliasing from the poor number of clear images available. This is especially bad in the winter.  Aug / Sept seems OK. TheNE Pacific is just about the worst place to do ocean color remote sensing. So Cecille’s data assimilation fields might be very interesting to look at these processes over the annual time scale

We also worked up movies of AVISO merged sea level anomaly fields for the study region (delta = 10 day). See ftp://ftp.eri.ucsb.edu/pub/org/oceancolor/fields/Exports/seaLevelAnomalyAnimations/ <ftp://ftp.eri.ucsb.edu/pub/org/oceancolor/fields/Exports/seaLevelAnomalyAnimations/> Not much mesoscale variations near Station P. Feature SLAs are maybe 10 or so cm above the background (again careful about reading too much into these and be concerned about mapping errors).  

Hope this is helpful…

Dave

> On Aug 11, 2017, at 7:36 AM, Cecile S. Rousseaux <Cecile.S.Rousseaux at nasa.gov <mailto:Cecile.S.Rousseaux at nasa.gov>> wrote:
> 
> We can provide daily maps/data files of chlorophyll/primary production (total and group specific) for 2015 at 1-degree resolution. I know that this resolution is a bit coarse but this is a product we have now available and could easily look at temporal and spatial variability of those variables for the area and time of the year you are interested in (nutrients, phytoplankton composition etc are also available if you are interested). This is a run where we assimilate satellite ocean chlorophyll.
> Let me know if you are interested. I can make some maps/movies as well as stage the data on a ftp site today before I leave. Unfortunately I will be away all of next week so won't be able to attend the telecon.
> 
> Cecile
> 
> On 8/11/2017 12:01 AM, David Siegel wrote:
>> Hi Susanne et al.,
>> 
>> Thanx for reminding me and telling them we can use their help (the OSSE PI emails are on this email list!!). So OSSE folks, please contribute to this discussion if you can.  Issues we are trying to resolve are science reasons to 1) reduce cruise duration (≤ 27 days) while ensuring we make stable estimates of BGC fluxes, 2) changing location from station P (likely south or west) and 3) altering cruise departure and its relation to the timing of regional BGC processes in summer and fall periods.  
>> 
>> We will discuss this on the telecom on Tuesday. 
>> 
>> Dave
>> 
>> 
>>> On Aug 10, 2017, at 6:09 PM, Susanne Menden-Deuer <smenden at uri.edu> <mailto:smenden at uri.edu> wrote:
>>> 
>>> Dave
>>> 
>>> thanks for all the info. Has there been any feedback from the OSSEs group on the effect of timing on the duration and types of ECCs likely to be encountered at P and south? I know that is a big question, so info on a subset will also be helpful.
>>> 
>>> Best
>>> 
>>> smd
>>> 
>>> On 8/10/17 9:00 PM, David Siegel wrote:
>>>> Hi All,
>>>> 
>>>> Thanx for the input on the cruise parameter google document so far. As I am learning, if we are to change our ship request, we must do it shortly. So I would like to see if we can come to a consensus as a team on issues of duration, location & departure date in that order using our inputs from the google doc. Let’s have that discussion on our next telecom on Tuesday Aug 15 - 9amPT/NoonET. Numbers follow...
>>>> 
>>>>       USA Toll Free # 1 844 467 4685
>>>>       USA Local/Toll # + 720 259 7012
>>>>       Participant Passcode:  804464
>>>>       Contact Vidal or Ivona if you need a non-US dial in #
>>>> 
>>>> We as a group have to advise the NASA what will work best for the project overall.
>>>> 
>>>> Best, Dave
>>>> 
>>>> Cruise Parameters Google Doc…
>>>> https://docs.google.com/document/d/1g_stpkL39brMoF9iK4UjbSQSsieKiwktG1_tzAWZDI0/edit <https://docs.google.com/document/d/1g_stpkL39brMoF9iK4UjbSQSsieKiwktG1_tzAWZDI0/edit> 
>>>> 
>>>> 
>>>>> On Aug 9, 2017, at 12:06 PM, David Siegel <david.siegel at ucsb.edu <mailto:david.siegel at ucsb.edu> <mailto:david.siegel at ucsb.edu> <mailto:david.siegel at ucsb.edu>> wrote:
>>>>> 
>>>>> Hi All,
>>>>> 
>>>>> As you can see there are (too) many moving parts in this operation. One thing we agreed upon in yesterday's telecom was a discussion on the cruise duration, siting, departure date, etc. so we can maximize return on NASA’s investment.  Ivona and I have started a pro-con rationale document to spur this discussion on the following google doc.
>>>>> 
>>>>> https://docs.google.com/document/d/1g_stpkL39brMoF9iK4UjbSQSsieKiwktG1_tzAWZDI0/edit <https://docs.google.com/document/d/1g_stpkL39brMoF9iK4UjbSQSsieKiwktG1_tzAWZDI0/edit> 
>>>>> 
>>>>> It is not complete and needs your input and to initiate other options.  This is important. We need to balance science returns with where we want to make investments.  Sea time is VERY expensive (>$80K/day for both ships & techs) and for every $ spent there is $1 not spent on science.  Talk with you all next Tuesday.
>>>>> 
>>>>> Best, Dave
>>>>> 
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>>> -- 
>>> Susanne Menden-Deuer, Ph.D.
>>> Professor of Oceanography
>>> 
>>> University of Rhode Island
>>> Graduate School of Oceanography
>>> Bay Campus
>>> Office: 230 Coastal Institute
>>> Narragansett, RI  02882, USA
>>> 
>>> 
>>> skype: mendens
>>> http://mendendeuerlab.com/ <http://mendendeuerlab.com/>
>>> 
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