For those who have sailed on the Star before, I'm assuming the 4:00 departure from LA is Pacific Time. Does the time change when you get on the ship? How does the ship's time relate to the time in the ports? And will Daylight Savings Time affect that?

Your best bet is to always stay on ship's time. On the second day, we were told to turn our clocks one hour ahead that night (losing one hour's sleep). Then, on the last night of the cruise, we were told to turn our clocks one hour back (gaining one hour's sleep).


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Yes, the departure time is Pacific time. I am not certain what effect Daylight Savings Time will have. But if I had to guess (and I do), I would say the ship will continue to follow the same procedure as indicated above.

There is a "time-zone problem" on the Star's Mexican Riviera cruises that would be lessened of it were made clear that the ship moves through three (3) time zones during its 8-day itinerary. It begins, of course, in Pacific-time-zone Los Angeles, and on the first day at sea the ship's time shifts forward one hour (Mountain time zone) and passengers are informed that this will remain "ship's time" for the duration of the cruise, until the last day when returning to L.A.

Some confusion is caused by the fact that the first port of call, Acapulco, is in the Central time zone - one hour ahead of ship's time. The fact that ship's time is an hour ahead of L.A. is easily understood and well publicized.

Consequently, those passengers who have not undertaken a detailed study of North American time zones assume, reasonably enough, that the ship's first port of call is in the time zone which the ship adopted as "ship's time" the day after departing L.A. But they would be wrong. Acapulco is in the Central time zone, two hours ahead of L.A. and one hour ahead of ship's time. Since everyone changes their watches to ship's time when instructed to do so, many passengers wander around Acapulco unaware of the fact that the local time is not what they assume.

This causes problems for folks who go into the city on their own (not on a shore excursion) and rely on clocks in Acapulco. I had arranged to be picked up at the pier by a friend who lives in Acapulco, and arrived at the pier entrance 15 minutes early (I thought), but my friend told me he had been waiting for 45 minutes. That was my first realization that local time in Acapulco is an hour ahead of ship's time. I also heard unsettling stories of passengers who barely made it back to the ship before its departure because of the same confusion. (Puerto Vallarta is in the same time zone as Acapulco.)

In late spring each year, the National Oceanic and Atmospheric Administration (NOAA) releases an estimate of the size of the hypoxic zone for the summer. This forecast predicts the size of the zone using an ensemble of four nitrogen-focused models that consider USGS springtime nitrogen loadings to the Gulf. Later in the summer (typically late July), NOAA supports an annual cruise to physically measure the extent of the zone. This graphic illustrates the frequency of bottom-water hypoxia measured from 1985 to 2014, presenting where hypoxia is more prevalent in the Gulf of Mexico.

NOAA's Gulf of Mexico Hypoxia Watch evolved as a cooperative project among NOAA's National Marine Fisheries Service (NMFS), the National Coastal Data Development Center (NCDDC), and the CoastWatch - Caribbean/Gulf of Mexico - Regional Node. The objective of Hypoxia Watch is to develop new near-real time data and map products using shipboard measurements of bottom-dissolved oxygen and disseminate them over the Internet. Access measurements taken from 2001 to the current season.

This measurement brings the five-year average to 4,347 square miles, which is more than two times larger than the 2035 target set by the Mississippi River/Gulf of Mexico Hypoxia Task Force (HTF). The annual dead zone survey was led by scientists at Louisiana State University and the Louisiana Universities Marine Consortium (LUMCON) during a research cruise from July 23 - July 28 aboard the LUMCON R/V Pelican.

In June 2023, NOAA forecasted a below-average sized hypoxic zone of 4,155 square miles (the record of 8,776 square miles was set in 2017). While the model results overestimated the measured size of the zone this year, they were within the expected margin of uncertainty for the forecast and provide further evidence of the robustness of the models to relate nutrient inputs to observed hypoxia size in the summer.

The HTF uses the annual hypoxic zone size determination as a key metric to measure progress toward achieving the five-year average target of 1,900 square miles or smaller by 2035. Maintaining ongoing summer surveys and calculating a five-year average allows scientists to capture the true dynamic nature of the zone more than a single annual measurement.

Exposure to hypoxic waters has been found to alter fish diets, growth rates, reproduction, habitat use and availability of commercially harvested species like shrimp. For the past two years, scientists from North Carolina State University and NOAA Fisheries have been using an experimental model to better forecast shrimp distribution relative to the hypoxic zone. NOAA has also been continuing to work in collaboration with States to develop new tools to forecast runoff risk, which help limit nutrient runoff to waterways by identifying the optimal times for fertilizer application within these and other watersheds.

In addition to its annual hypoxia forecast and survey, NOAA supports efforts to develop monitoring technologies to understand and map the dead zone, as well as to study the impacts of hypoxia on fish and fisheries in the Gulf of Mexico and elsewhere through its Coastal Hypoxia Research, Ocean Technology Transition, Uncrewed Systems, and Hypoxia Watch Programs. Furthermore, NOAA continues to partner with and support the Northern Gulf Institute to deliver technical assistance, observation and monitoring and coordination across federal, state, academic, and private sector scientists.

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Two weeks ago, I was able to take part in the 6 day Northern Gulf of Mexico research cruise. This is its 31st year that it is going on and our third year taking part in it (see 1, 2). This year I was the lucky one to go instead of Dr. Thrash. This was my first official collection cruise so I was pretty excited to finally get out on a boat and put into practice everything I had learned while at the CMORE summer course.

Once again, our lab was working with Dr. Olivia Mason from Florida State University and her graduate student Lauren Gillies (@GilliesLE), who recently published a paper with Dr. Thrash from the 2013 research cruise: Archaeal enrichment in the hypoxic zone in the northern Gulf of Mexico. Congrats to them!

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information

The 2020 Gulf of Mexico hypoxic zone or "dead zone" measured 2,116 square miles and was the 3rd smallest in the 34-year record of surveys. The 5-year average is now down to 5,408 square miles. The earlier forecast for the dead zone was higher at 6,700 square miles. A major factor for the smaller measured size was due to extensive mixing caused by hurricane Hanna, which passed through the Gulf right ahead of the survey cruise. For more information, see the Lousiana Universities Marine Consortium (LUMCON) Exitand the National Oceanic and Atmospheric Administration (NOAA) Exit press releases. Map of measured Gulf hypoxia zone, July-August 2020. (LUMCON/NOAA)

NOAA and the United States Geological Survey (USGS) released their 2019 forecast for the summer hypoxic zone size in the Northern Gulf of Mexico on June 10, 2019. Read the full press release. EXIT Scientists are expecting the 2019 area of low oxygen, commonly known as the 'Dead Zone,' to be approximately 7,829 square miles, or about the size of Massachusetts. This prediction is large primarily because of high spring rainfall and river discharge into Gulf.

The hypoxic zone in the northern Gulf of Mexico is an area along the Louisiana-Texas coast, where water near the bottom of the Gulf contains less than two parts per million of dissolved oxygen, causing a condition referred to as hypoxia.

Each summer, the size of the hypoxic zone is measured. The size of the zone is an important indicator of how much progress is being made to reduce nutrient inputs into the Gulf of Mexico. Sometimes the size of the zone is influenced by other factors, such as droughts or hurricanes that can reduce the size of the zone, or floods that can increase the size.

During June 1998, the U.S. Geological Survey (USGS) and the University of Mississippi Marine Minerals TechnologyCenter (MMTC) conducted a 12-day cruise in the Mississippi Canyon region of the Gulf of Mexico (Fig. 1). The R/VTommy Munro, owned by the Marine Research Institute of the University of Southern Mississippi, was chartered for thecruise. The general objective was to acquire very high resolution seismic-reflection data across of the upper and middlecontinental slope (200-1200-m water depths) to study the acoustic character, distribution and potential effects of gashydrates within the shallow subsurface, extending from the sea floor down to the base of the gas-hydrate stability zone.

The Gulf of Mexico is well known for hydrocarbon resources that include petroleum and related gases. Areas of the Gulf that lie in waters deeper than about 250 m potentially have conditions (e.g., pressure, temperature, near-surface gas content, etc.) that are right for the shallow-subsurface formation of the ice-like substance (gas and water) known as gas hydrate (Kvenvolden, 1993). Gas hydrates have previously been sampled in sea-floor cores and observed as massive mounds in several parts of the northern Gulf, including the Mississippi Canyon region (e.g., Anderson et al., 1992). Extensive seismic data have been recorded in the Gulf, in support of commercial drilling efforts, but few very high resolution data exist in the public domain to aid in gas-hydrate studies. Studies of long-term interest include those on the resource potential of gas hydrates, the geologic hazards associated with dissociation and formation of hydrates, and the impact, if any, of gas-hydrate dissociation on atmospheric warming (i.e., via release of methane, a "greenhouse" gas). 152ee80cbc

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