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The Trident is one of the United States' submarine-launched ballistic missiles. China is on the verge of deploying its own, the JL-2 www.6park.com
Read more: What China’s Nuclear Missile Subs Mean for the U.S. - Popular Mechanics  www.6park.com

　太平洋水下将上演猫捉老鼠的游戏。如果卫星监测到有中国潜艇离港，美国潜艇可能会静候。“当中国潜艇出动时，可能会有一些美国攻击型潜艇跟踪” www.6park.com

 
　　美国《大众机械》杂志网站11月13日文章，原题：中国的核导弹潜艇对美国意味着什么　 美国报告称，经过几十年努力，中国即将拥有真正的水下核威慑力，其新造的远距离潜艇配备了新型远程核导弹。太平洋因此可能变成紧张的军事区，就像冷战时期的大西洋那样。 www.6park.com
　　五角大楼警惕地注视着北京扩充潜艇部队。潜艇有助于中国保障经济上至关重要的海上航线安全，并保护本国近海免遭入侵。中国的核动力潜艇配备核武器，会对美俄印等全球大国构成另一种威胁。这种新威胁对美国意味着什么？ www.6park.com
　　太平洋水下将上演猫捉老鼠的游戏。如果卫星监测到有中国潜艇离港，美国潜艇可能会静候。“当中国潜艇出动时，可能会有一些美国攻击型潜艇跟踪”，美国科学家联盟的分析家汉斯·克里斯滕森说，“这也是为了更多了解中国潜艇的噪声大小和行动规律。” www.6park.com
　　中国潜艇搭载的“巨浪-2”核导弹射程约为4500英里。这意味着潜艇从该国沿海发射的导弹打不到美国大陆。它们或许能够从夏威夷以西1000英里的地方打到洛杉矶，但若想将华盛顿特区纳入射程，（中国潜艇）只有熘进距美国西海岸1500英里的地方。 www.6park.com
　　这些潜艇所面临的关键问题是：如何在中国水域以外的地方生存。日本和美国在太平洋安装了能监测潜艇的设备，中国潜艇必须躲过其监控，才能到足够近的地方对美国本土发射导弹。 www.6park.com
　　克里斯滕森引述海军情报局的报告称，中国的晋级核潜艇隐身性比俄罗斯20年前制造的潜艇还差。“噪音太大，无法突破反潜网络”，他说，“美国潜艇部队拥有60多年的跟踪核动力潜艇的经验……因此，若中国的（这些潜艇）在战争中存活长久，那将是令人惊讶的。在我看来，它们会变成活靶子。” www.6park.com
　　五角大楼正开发能有助于减少中国潜艇威胁的下一代跟踪技术。抵御中国潜射导弹威胁的最后一道防线是部署在阿拉斯加的陆基拦截器。克里斯滕森表示，它们可用来拦截中国的潜射导弹———若弹头是从足够远的地方发射的。 www.6park.com

http://www.popularmechanics.com/technology/military/missile-defense/what-chinas-nuclear-missile-subs-mean-for-the-us-14726083 www.6park.com

The U.S. government is reporting that China, after decades of trying, is on the verge of fielding a true underwater leg of its nuclear deterrent, with new long-range missiles tipped with nuclear weapons on board its fleet of new long-range submarines. And that could transｆｏｒｍ the Pacific into a tense militarized zone reminiscent of the Atlantic during the Cold War.  www.6park.com
On November 14 the U.S.-China Economic and Security Review Commission will release its annual report to Congress, and that report will contain some sobering language about new Julang-2 missiles China plans to field in two years. (Drafts of the report, created by a Congressional mandate, have already been leaked.)  www.6park.com
According to the report, JIN-class submarines, two of which have already been put to sea, would carry nuclear tipped missiles. Naval intelligence documents estimate five such submarines will be ready for service. The submarines and the JL-2 missile combination will give Chinese forces "a near-continuous at-sea strategic deterrent," according to the report, and Beijing is "on the cusp of attaining a credible nuclear triad of land-based intercontinental ballistic missiles, submarine-launched ballistic missiles, and air-dropped nuclear bombs."  www.6park.com
The Pentagon has watched warily as China has ramped up its submarine fleet, which helps the nation secure its economically vital sea lanes and protect its coastlines from incursion. China has quiet, diesel–electric submarines to lay mines and shoot missiles during combat close to their shores. But the larger, nuclear-powered subs are a newer acquisition, and arming them with nukes poses a different kind of threat to the United States and global powers such as Russia and India.  www.6park.com
Sub-launched ballistic missiles (SLBMs) are hard to spot until they shoot, making them the ideal second-strike weapon in a nuclear exchange. The Pentagon knows where all of China’s ICBM silos are and could wipe them out in a preemptive nuke strike if the nations came to blows. But subs need to be identified, tracked, and sunk. So, having submarines with nukes in their firing tubes makes China a more credible nuclear threat. That threat backs up every diplomatic, geopolitical, and military action of the government—a government whose goals are often at odds with those of the U.S. government.  www.6park.com
What will the U.S. do about this new threat?  www.6park.com
There will be some underwater cat-and-mouse games played in the Pacific. U.S. submarines will likely be waiting when American satellites spot a Chinese sub leaving the port. (Those subs will be visible in the shallows between Yulin Naval Base and deep water.) "Some U.S. attack submarines probably will follow the Chinese submarines if and when they deploy," says Hans Kristensen, an analyst with the Federation of American Scientists. "Part of those operations will be to learn more about noise level and operational patterns."  www.6park.com
The range of the JL-2 is about 4500 miles. That means the sub’s missiles can’t target the continental United States from the Chinese coast. They could hit Los Angeles from a position 1000 miles west of Hawaii, while Washington, D.C., would be in range only if the submarine could sneak its way to a position about 1500 miles from the West Coast.  www.6park.com
That’s the trick for these subs: surviving outside Chinese waters. Japan and America have assets in the Pacific that could detect submarines; a Chinese skipper would have to hide from them to get close enough to take a shot at the continental United States. And Christensen cites Office of Naval Intelligence reports that say the JIN submarines are less stealthy than Russian submarines built two decades ago. "They are too noisy to slip through U.S. antisubmarine networks," he says. "The U.S. submarine community trained for more than 60 years to track nuclear-powered ballistic submarines . . . Given that record, I’d be surprise if China’s would live for long in a war. To me, they would be sitting ducks."  www.6park.com
However, American antisubmarine capabilities have waned since the Cold War. The United States will be decreasing its number of attack submarines, but those that remain will be operating in the Pacific—the Pentagon has already deployed more attack subs to Guam and Hawaii. The Littoral Combat Ship, a troubled Navy program, is expected to have antisubmarine capabilities, but those ships (as the name implies) are made to dominate shallow water.  www.6park.com
Furthermore, last week news leaked that the Navy plans to cut nearly one-quarter of its highly specialized multi-intelligence aircraft in the next few years, including the P3C Orion sub-hunting airplane. It does have sub-tracking replacements coming online, such as the P-8A Poseidon, a converted 747 that can drop sonobuoys to detect subs, and torpedoes to sink them. But coverage may be thin. The Navy will have only about 50 P-8As to do the job ｆｏｒｍerly done by 200 P-3Cs.  www.6park.com
During the Cold War, the Navy tracked Soviet subs using a network of underwater microphones called the Sound Surveillance System (SOSUS). This is still functioning, albeit with fewer sensors, in the Pacific. The Pentagon is working on next-generation tracking technology that could help mitigate the China sub threat. The Distributed Agile Submarine Hunting program, run by DARPA, is creating a maritime version of a satellite. These robotic listening posts could operate in shallow or deep water, and possibly follow enemy subs once they’d been detected.  www.6park.com
The last-ditch defense against these missile threats are ground-based interceptors in Alaska, built to thwart an ICBM launch from North Korea. They could target the warheads fired from a submarine, Kristensen says, if the warheads were launched from far enough away.  www.6park.com