[Exports_project_office] EXPORTS N Atl

[Bethany Jenkins]

Hi Dave and all,
I've gone through the Survey ship schedule and thought about integrating
our operations into that plan and sent it to our team. My postdoc Sarah is
working with it right now to estimate time we would need for each cast/tow.
The towing can happen on our way to or way off the process site and we've
currently planned majority of the experiments requiring towing on days the
survey ship would be in motion. If we need to tow on a day the survey ship
needs to remain near the process center, we can combine that with the
passage out to the poop run as we were doing on the Revelle.

When we talked as a team with Mark the other day, there are ways he can do
his work off the survey ship without the dawn cast and we can run
everything we would need for process center measurements off the noon TMC
cast. If Mark stays on the process ship it leaves us without some critical
contextual information on our experiments and very short handed on sampling
days when we need part of our team in the TMC clean area. I am very
reluctant to have our team split.

We'll send more detail soon,
Best wishes
Bethany

On Wed, Sep 30, 2020 at 11:12 AM David Siegel <david.siegel at ucsb.edu> wrote:

> Hi Mark, Bethany and Kristen,
>
> Thank you. Yes, we will owe you all beers. Hope to share them with you all
> soon…  Having a group to move in some form is key to getting this all to
> work. Yours is the most obvious. So, thank you.
>
> The important issues to resolve now are 1) whether Mark moves along with
> Bethany's and Kristen’s groups to the Survey Ship and 2) the timing and
> locations of the sampling you all need while remaining consistent with the
> mission of the Survey Ship. We can resolve the other more logistical issues
> below once we decide on these two factors.
>
> So, #1. The berthing numbers could work out for both ships with Mark
> staying on the Process Ship. That has been my plan of the moment. I do see
> your points below and agree that it would be optimal if we can keep you all
> together.  To do so, will mean that we will need to eliminate one berth
> from one group on the Survey Ship. We will start thinking about how to do
> that shortly. It is possible as we have added 1 to the Hydro team
> operation, 1 for the UCTD and 1 to Collin’s group compared with the Ride
> operations.
>
> WRT issue #2, the Survey Ship has multiple missions it needs to conduct
> including supporting Process Ship science (234Th and pumps) at he “core” as
> well as conducting spatial sampling from the “core” along “spokes” which
> can be ~200 km distant from the Process Ship when we are doing a “survey".
> The plan of the moment would have the Survey Ship at the “core" (within 10
> km of the Process Ship) roughly 1/2 the time during an epoch (while traps
> are in the water and maybe two times more times). It seems that doing  the
> TMC casts during the noon time makes the most sense and you would optimize
> these based upon whether we are at the “core”.  I need more detail on the
> other needs Bethany and Kristen have for their sampling. The TMC tow fish
> seems straight forward (especially with a better pump) although I agree
> with you that early morning TMC rosette casts may be challenging.
>
> The PO folks will be chatting tomorrow morning about paths forward. You
> have helped a ton.  Thanx. Need to figure out how to make this all fit the
> berthing we have and the science we need to do.  Bethany/Kristen - would be
> good to have your inputs before then.
>
>
> Best, Dave
>
>
>
>
> > On Sep 28, 2020, at 4:46 PM, Mark Brzezinski <
> mark.brzezinski at lifesci.ucsb.edu> wrote:
> >
> > Dave, Craig (Survey), Deb & Jason (Process)
> >
> > The Jenkins group has a long meeting today to discuss our science on
> EXPORTS N Atl.  We are resigned to having to move most if not all of the
> Jenkins group to the Survey ship.  Moving the trap group is the only other
> viable alternative, but if they really need to pull traps on three
> staggered days (which I don't really understand) then the mission of the
> Survey ship is crippled.  That won't work. The idea of removing a person
> from each of 5 groups is equally impactful as everyone is already short
> handed and 5 groups will be crippled. So moving us, as undesirable as it
> is, is the least harmful choice to the overall program. Everyone owes us
> beers.
> >
> > A big issue for the Jenkin's project is whether I stay on the Process
> ship or move with the group to the Survey ship. The trade offs are these:
> My rate measurements are well aligned with the 14C work by James and the
> 15N work by Adrian. In fact I was originally funded to do 14C, 15N and 32Si
> work all myself, but I eliminated my 14C and 15N to reduce redundancy and
> berths. So it is a positive to keep these measurements together. The
> negative aspect of me staying on the Process ship is that I lose access to
> TM clean water (Fe limitation occurs in the lower euphotic zone in the N
> Atl), but more importantly it creates a huge labor shortage when the
> Jenkin's group sets up and breaks down experiments on the Survey ship. We
> did 6 experiments, each with a significant (half day or so) set up and tear
> down period. So we'd need a person to work with us 12 half days out of 24
> cruise days (3 eight-day epochs). We just don't see where any other group
> on the Survey ship can give us that much time, especially considering that
> the Survey ship folks are giving up berths to accommodate those that move
> over. The bottom line is if I don't move with the group everything the
> Jenkin's group is doing outside of rate measurements is highly compromised.
> So unless you see a way to provide the Jenkin's group with what is
> essentially a half time person we think that all of us need to move
> together.
> >
> > Science Implications:
> >
> > 1) With some planning I can likely do a few simultaneous 32Si, 14C or
> 13C, 15N profiles on the Survey ship so we will can  get some info on
> stoichiometry directly on the Survey ship and indirectly by combining 32Si
> on the Survey ship with 14C and 15N from the Processors ship
> >
> > Logistical considerations:
> >
> > 1) If I move then we would need a rad van on the Survey Ship.
> >
> > 2) I have a single 3 x 5 foot deck incubator with 6 light depths built
> in that I can bring for my rate profile incubations.  All light levels will
> be cooled with surface seawater with none chilled with mechanical chillers
> like on the process ship, but that's a sacrifice that will need to be made.
> These would be in addition to Bethany's two large incubators
> >
> > 3) Uta used my POC filtration rig on the Process ship.  If I move she'll
> need to use a different rig.
> >
> > 4) I will bring my Turner 10-AU fluorometer on the Survey ship so the
> Process ship will be down 1 flourometer.
> >
> > 5) If I move there's no need to identify an additional person to remove
> from the Process ship.
> >
> > 6) I can start my 24h rate measurements at noonish on the Survey ship
> using water from Bethany's transcritomics cast.  A significant number of
> pre-dawn casts in the core seem very difficult if not impossible on the
> Survey ship.  The main reason for pre dawn casts for 24 h rates is the ease
> of keeping dark-adapted cells out of bright light. I can adjust using
> opaque coolers and black garbage bags as light shields for incubation
> bottles. Seems there are 4 opportunities per epoch for noonish sampling of
> the core.  Realizing three of those per epoch for rates (shallow, 100m ish,
> TM cast) would be ideal.
> >
> > We are looking at the Survey ship schedule to see when we can get TM
> casts and towfish time. More on that from Bethany later.
> >
> > So that is our current thinking. How does this work with your current
> planning?
> >
> > Best,
> >
> > Mark
> >
> > --
> > Mark Brzezinski
> > Distinguished Professor, Director
> > Marine Science Institute
> > University of California,
> > Santa Barbara, CA 93106
> > 805-893-8605
> >
>
>

-- 
Bethany D. Jenkins, PhD (she, her, hers)
Professor
Department of Cell and Molecular Biology and Graduate School of
Oceanography
Director Biological and Environmental Science Graduate Program
University of Rhode Island
279 CBLS
120 Flagg Road
Kingston, Rhode Island 02881


bjenkins at uri.edu
Phone: 401-874-7551
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