Mysterious leaks in major gas pipelines that connect Russia and Europe have researchers scrambling to estimate the greenhouse gas emissions.
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| On September 27, gas burst above the Nord Stream pipelines in the Baltic Sea. Credit: Xinhua/Shutterstock |
The underwater Nord Stream gas pipelines, which run from Russia to Germany and are located close to the Danish island of Bornholm in the Baltic Sea, have been showing signs of mysterious leaks since September 26.A real-life geopolitical whodunit has developed as a result of the tense energy situation that Russia and the West have been in since Russia's invasion of Ukraine. NATO is now among those claiming that the leaks were caused by sabotage. Other researchers are attempting to estimate the amount of methane, a potent greenhouse gas, that will be released as a result of the leaks after seismologists discovered data that may assist in determining the source of the leaks.
On September 26, the Nord Stream 2 pipeline's operators observed a sudden drop in pressure from 105 bar (105 times atmospheric pressure) to 7 bar overnight. A 1-kilometer-wide region of the Baltic Sea's surface was soon covered in gas bubbles from the escape.
Since Russia invaded Ukraine in February, the Nord Stream 2 pipeline has been shut down. However, it is still full of gas, which is believed to be around 90% methane. According to Björn Lund, a seismologist from Uppsala University in Sweden, the drop in pressure prompted them to examine their data more closely. This has been an extraordinary week thanks to the focus on seismology data. According to Lund, his network detected seismic activity at the same time as the leak that is consistent with explosions rather than earthquakes, which have a different seismic fingerprint. I've never experienced anything like it.
The climate community has also been on high alert as a result of the events. When he heard about the leak in Nord Stream 2, Andrew Baxter, who used to be an engineer in the oil and gas industry and is now the director of energy transition at the Environmental Defense Fund, a New York City-based organization, "switched back into engineering mode" to try to quantify the methane released as a result. He says, "I came up with a very rough estimate because there are so many variables and unknowns that it is very difficult to say how much methane has entered the atmosphere."
Based on the dimensions of the pipe and the water temperature, Baxter estimated that 115,000 tonnes of methane had probably been released during the initial sudden drop in pressure in Nord Stream 2.Methane has a much stronger greenhouse effect per unit mass than carbon dioxide does, especially in the short term. According to Baxter, this leak has an impact that is comparable to the annual carbon emissions from two million automobiles.
According to climate scientist Zeke Hausfather of Berkeley Earth, a California-based non-profit that conducts data analysis, "if these numbers end up being confirmed, it would be the one of the largest single leaks of natural gas in history in a single location. "However, he adds that this has no significant effect on the magnitude of global emissions.
According to Mark Davis, chief executive of Capterio, a London-based company that tracks gas flares from the oil and gas industry but was unable to detect the vented gas because it was not burning, the event—despite its size—only accounts for 0.14 percent of the global methane budget. He argues that by converting the methane into carbon dioxide, lighting the leak after it was discovered could have significantly reduced the damage. Leaks have also been reported in the adjacent Nord Stream 1 pipeline, which is also currently inoperable, since the initial pressure drop in Nord Stream 2.
Satellite measurements It will take time to precisely measure the amount of methane released.
Geography and unfortunate circumstances have hampered efforts thus far. Itziar Irakulis-Loitxate, who uses satellite data to measure atmospheric methane levels, says that the public satellites that environmental observations rely on were not facing the right way at the time. Additionally, it was nearly impossible to collect any data due to the prevalent cloud cover at northern latitudes. In addition, monitoring methane over water presents a challenge: In a spectrometer, any signal from methane is masked by water, which takes in the majority of the sunlight.
At least one observatory was able to see the methane spike from below: the European Integrated Carbon Observation System project's Swedish Hyltemossa station.
Scientists will keep trying to figure out how much methane has been released as a result of the leaks in the coming days and weeks. Seismologists might also be able to assist in figuring out how the pipes broke.
Lund and his team already have the suspicion that TNT is to blame for the Nord Stream explosions after comparing the seismic data they collected with data from previous naval explosions.
The complex geology of the Earth's crust in the region between Denmark and Sweden makes it difficult for Lund and his colleagues to determine the precise number of blasts that occurred from their seismic data. According to him, there has been a significant alteration in the thickness of the rock material's crust.
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